For us, we both really like the ones that are part porn/part education such as the Sinclair Institute's Better Sex series. Since the focus is as much on being informative as well as arousing and having actual committed, loving and average looking couples in them, I believe this is why this kind of porn appeals to both genders (but especially women) from everything I read.
Although we don't watch much porn nowadays (once you've been involved in actual multiple-partner sex with real people, watching movies becomes rather blase), but when we do we will usually re-watch one of those and since it's educational as well it makes it possible to actually watch the whole thing to the end.
For traditional movies though we both prefer old school porn (70's and 80's) since being before the days of plastic surgery and body shaving, the actors, once again, are more likely to look like average people rather than all muscle and silicon. Most of these movies, unlike modern porn, are more likely to have an actual plot and performers who can act as much as fuck, even if they involve a lot of unlikely scenarios with the pizza man or pool boy.