Either we don't notice a difference at all, or the texture is actually uncomfortable. What's worse is 'heating, tingly or cooling' sensation condoms which can cause burning and irritation and end the sex session quickly. We prefer smooth condoms with regular lubrication.
I loathe condoms, and fortunately I'm in a monogamous relationship and on birth control so don't have to use them anymore. I think no matter what kind you use, they all feel unnatural. I like the skin to skin feeling.
I'm not convinced there's much of a difference between regular and ribbed. I don't have much experience with ribbed, though. I guess I could be wrong. But I strongly prefer nonlatex, which typically only comes in "regular."
Ribbed condoms are hit and miss with me. Sometimes the ribs hurt. My boyfriend and I use plain, ultra thin non-latex condoms by Trojan. He has never complained about wearing condoms and it feels good to him either way so it doesn't matter.