Guilty, of both. If I see a book has a prologue usually, I skip it & look for another book. But, one of my favorite books has both a prologue and epilolgue. I think I read it five times before realizing it *had* a prologue. When I read the prologue I thought it was superfluous - all it did was expand on one piece of information about the MC without adding anything critical to the story. I got round to reading the epilogue after reading it about 10 time (yes, I really think I read this book that many times). Basically, it was an extension of the ending - that is, the material, which followed immediately in story-time, made explicit something I guessed at.
I like to begin reading a story in story 'now' time, with the main character. That's usually why I skip books with prologues. I think I have said before that I skip prologues. But really, I skip books with prologues. But, if Ch 1 looks interesting enough for me to read, I'd start from Ch 1, and if I got to some thing really confusing, I'd look at the prologue. Otherwise I'd keep reading and read the prologue after I finished. See what light, if any, it sheds.