Nope. It's just go with whatever you like most.

I agree, it's all about what appeals to you the most.

They can be hard to grip for small, wet, or elderly hands.

Well I think oval knobs are generally more modern and round ones more traditional, but obviously styles vary considerably. Certainly the type of knob or handle can tremendously affect the style of a kitchen or whatever you're doing.
I think you need to try out a sample one or two to make up your mind.

KarinL

I happen to love and have them in our home. I've found that they can also be opened with your elbow when your hands are full of grocery bags--which is great! Not quite as easy as levers, but easier to open for elderly and small hands. Ours happen to be brushed nickel right now, but have had them in other homes in brass.

It's more about what feels easier to manipulate in your hand than the visual look.

You might think it's "just" a doorknob--I did. But even tho I thought the round knobs were cool and modern-looking, and the eggs less modern, those round ones were too slippery. Also think ahead 10 or more years: For some people, hand strength wanes.

Also, I don't know which manufacturer you're looking at, but the visual of the egg-shaped doorknobs does tend to morph into a flatter look if there's a "rose cover" -- the part that goes flush against the door itself -- that's fully round. So again, that's where the value of "looks" is diminished. From a distance, you don't see "egg," you see "round." I'll post a photo to show you what I mean. (Some manufacturers are different; I didn't buy this brand, I bought Baldwin, in a different finish, but the visual is the same.)

Here is a link that might be useful: sure-loc's egg doorknob

Are you asking about cabinet hardware or doorknobs?

I'm asking about doorknobs! Thanks!