Hi, Teuth. Well, I can tell you which are some of the stronger-smelling ones (in my experience)

Guacamole

Fragrant Bouquet

Avocado

Fried Bananas

Cathedral Windows

Cerveza

Mojito

All of these grow well in my garden. Plantaginea is the species hosta where all other hostas get their fragrant genes. Plantaginea and its sports can also be very finickey about blooming. However, from what I understand, if you can get plantaginea to bloom, its flowers are by far the largest and strongest-smelling. 'Fragrant Blue' is a gorgeous plant, in my opinion, but in many cases seems to not be very fragrant. I'd still buy it on looks alone. Honestly, if you don't care for their looks, you may ultimately just end up replacing them. My suggestion is, buy what looks good to you before you buy a hosta just for the fragrance, although I think they smell wonderful (But I also think most of them are quite nice-looking, too).

I actually have a bed that is almost all fragrant hostas...Here is a pic ^^^up thataway : )