Although my wife likes wavy textures for glass toys - now she's fallen in love with the natural feel of realistic Vixskin dildos. For her it's like having the real thing without ED or PE issues, not to mention sizes that are not available to a monogamous female.
I tend to like little nubs internally--not fond of lots of ridges or anything like that.. I got the G Twister recently, which has spikes on the clitoral arm, & I LOVE that way more than I thought I would! They feel really cool.