Depending on the girl and the scene, either can be interesting. But overall, I've found myself gravitating to glamour photos more & more these days. It seems like there's a LOT more imagination being used in that genre, compared to the standard (tired) sex scenes, whether amateur or production house porn.
If its a well established model then I like seeing them in a professionally shot set of pictures. Its what we expect from them, not that I dont enjoy candid pics of course. But I come to the pros for just that, quality work.
Amateur pics, I think the whole appeal is that they are amateur, innocent girl next door type pics, they could be our own girlfriends or wives.
Probably doesnt make much sense really. I think a pro girl in an amateur set is unfair, cause it doesnt do them justice. Like the really early sets of Erica Campbell, before she went pro werent great quality, the body wasnt fantastic but still a gorgeous girl. You never looked back after you saw the work she cranked out after.