>>1245
Some of the ways they can differ: Tightness, inner texture, depth, firmness, warmth, wetness, prominence of cervix. Outward appearance counts towards how nice it is to enjoy, as does colour, smell, taste, softness/length/position of pubic hair, plumpness of lips.
Then of course there's how long a pussy can take hard use in a given position before wearing out or becoming sore.
These different parts interact in ways you might not expect.
For example, one girl I remember had a very shallow but wide pussy. My cockhead almost immediately popped behind her cervix and I couldn't get myself to full depth without pushing hard and stretching the firm back of her pussy. But that wasn't the whole story. Her entrance was nice and tight but the middle part of her vagina ballooned out when she spread her legs and didn't grip me all that well even though I have a broad cock. The total effect was that every thrust I could feel her cervix "clicking" across my cock's ridge while the middle of my cock felt kind of suspended in space. It physically didn't feel all that nice for me, but her surprised ohgodwhatisthispleasedontstops were fun.
A different girl had the cutest innie pussy you've ever seen, a perfect smooth little thing with outer lips just plump enough to accentuate the dip of her entrance, which swelled ever so slightly and drooled juice when she was excited. It was tight and deep enough that I firmly pushed against her cervix at full depth. Her walls were all crinkled and soft, almost spongey - they kinda dragged against me as I thrust. Sounds great, right? But listen to this: As I fucked her more times, her pussy began to stretch out a bit, the folds straightened and became smooth. The smooth, silky tightness pressed back against me and felt much better to thrust in than the wet sponge it used to be.
Yet another girl had an outie pussy with inner labia that somehow managed to in the way during oral. But she had a wonderful taste, got wet practically when I clicked my fingers (not always an advantage: Sometimes she'd get so wet that sensation actually started to disappear) and had a very prominent clit that was fun to tease. She was comfortably tight - easy to fuck hard and fast but still felt great when I went slow. Her pussy had a little bit of the "sponge" quality like the girl above, but somehow in this pussy it worked to produce a different feeling, more like being licked by the rough part of a tongue rather than dragged against.
My girlfriend's pussy is very deep, comfortably tight, smooth yet soft and feels much warmer than other girls' pussies do when I first thrust in. It has a strong, musky and sweet flavour with thick, syrupy juice. I've had her exercise it so she can squeeze and milk my cock with it. I'm her first and only, so her pussy has over time become customised exactly to my cock. Other pussies feel better than hers for some kinds of sex - but it's still hers that I have to rank best of all I've ever had overall.
Those are just a few examples, but does that help answer your question?