No rose of any class can beat the roses in these two rose classes, which can bloom early in spring and late in autumn, and bloom continually between,
because of genetic reasons;
China
Tea
Unfortunately Tea sounds a lot like Hybrid Tea which causes folks to confuse the two different groups of roses (Hybrid Tea roses can be grown where snow covers the ground for months out of the year, Tea roses thrive in warm climates such as found in California. The rosebushes of each class are very different in appearance.
-Hybrid Tea rosebushes tend to have a rather stiff and upright way of growing, sometimes having sparse foliage that shows lengths of cane. Hybrid Tea rosebushes generally have longer flower stems, so they take longer to re-bloom
-Tea rosebushes are gloriously covered roses, and well covered with leaves most of the year near San Francisco, California, because they are evergreen plants. Where I live a garden of a dozen or so Tea rosebushes will bloom truly continously (the average rosebush blooms in flushes of between 28 and 35 days then stops blooming for a month or longer before it re-blooms) some folks only notice a rosebush when it is in bloom and therefore think a rosebush continuously blooms, but Tea rosebushes DO bloom without ceasing from early spring through late autumn and into winter.
The blossoms of Tea roses are beautiful and lovely, and have a delicacy and grace that has been largely bred out of Ultra- hybridized roses. thats just my opinion.
Old Garden Tea roses were originally bred in China from two warm climate roses: Rosa chinensis and Rosa gigantea
because of this, Tea rosebushes are evergreen.
These are among the most beautiful Tea roses that I've grown and known:
apricot
'Lady Hillingdon' I counted more than 101 days of continuous bloom with more than 33% of full bloom. I think it may be the most continually large flowered rosebush in the world, excluding roses of the China class. Lady Hillingdon blooms where I live from mid-March through most of December. Lovely apricot scent.
white
'Westside Road Cream Tea' another rapid re-bloomer, to me it is every bit as fragrant as Ducher, but w.r.c.t. is far more resistant to powdery mildew. I don't spray with anything so this is important to me. Far healthier where I live than Devoniensis or Mme. Alfred Carriere.
Pink and pink blends.
Le Vesuve' a China-Tea is certainly one of the most constant bloomers among the pink Tea type roses.
Another great thing about Tea rosebushes is that they bloom all over the bush, from a few centimeters above the ground, or even lying on the ground, all over to the tip- top of the bush.
Mme. Berkeley' is my favorite pink Tea rose, and it is the healthiest Tea rose in my garden.
Mrs. Dudley Cross' one of my other favorite pink Tea roses.
Yellow Tea roses: Etoille de Lyon" has a delicious scent, 'Alexander Hill Gray' is more of a pink edged yellow Tea most of the year in my garden.
Orange and/or yellow-red blends
if you like more vivid colors
orange red blends: Monsieur Tillier' orange and red and
Rosette Delizy' a red and gold blend Tea are good choices.
Orange blend Tea. sounds like a drink...no wait that's pekoe...
Clementina Carbonieri' is as colorful as some Pernetiana roses, has a more rounded shape than most Tea roses, and a more intense fragrance. In partial shade it will be a rich blend of deep peach and gold, with the gold bleeding through (as dye is said to "bleed") through the peach hue. I grow mine in full sun, which keeps the hues from bleeding. Others like my neighbor, prefer the more dramatic color from shading it, and find the bleeding a striking affect.
' Anna Oliver' a lovely hue of peach blended with rose-gold This is to me the most fragrant rose of this class. I like the clone that vintagegardens.com sells rather than the yellow one sold elsewhere.
pink, and very large blossomed 'Mrs. B.R. Cant' and Marie Van Houtte' a pink and yellow Tea are also very popular.
Comtesse Emmeline de Guigne' is a pretty peach rose in spring that turns totally pink in warmer weather and then back to peach in the cooler autumn weeks. I bought mine from vintagegardens.com
Francis Dubreuil' is the most fragrant red Tea..
Dainty Beauties:
There are also two half-Tea roses that were bred from a Tea rose crossbred with a Polyantha these are:
Perle d'Or" a small flowered peach colored rose, and a rose that has been popular for more than a hundred years, that's how beautiful this rose is, and fragrant!
'Mlle. Cecille Brunner', the Spray form of Cecille Brunner has a longer bloom cycle, but if you dead head the smaller c.5' tall form it will also continuously bloom.

helpmefind.com has photos of these roses.
vintagegardens.com sells all of these roses, and roguevalleyroses.com and antique rose emporium sell many of these grand Old Tea roses.

Best wishes,
Luxrosa
P.S. China class rosebushes bloom as often, or more than Tea roses but many of the China class blooms have smaller blooms or the petals appear loose, some people like myself, adore them. I'd advise you to look at some photos at helpmefind.com to decide for yourself, my former landlady was dismayed at the sight of 'Mutabilis' when we planted it by the front porch for she was thinking of a H.T. shaped rose bloom when she gave us permission to plant.
For good health, in the east Bay of s.f. area, Comtesse du Cayla' is good and Fabvier is the healthiest China locally. Cramoisi Superior is also healthy in a no spray garden in Oakland, Ca.
I don't grow 'Mme. Lombard' because it gets too much p.m. for my needs which is the same reason I got rid of 'Ducher' and Georgetown Tea and Angels Camp Tea. (the last was borderline in health and might have developed more resistance to disease, when the bush grew bigger. Tea class rosebushes do this, I believe Jeri Jennings discovered this fact.
I do get carried away by my love of Tea roses, didn't think this would be so long. Lux.