Hi, Justo. Being a child of the '60s, I've always had an affinity for cloth diapers. They're completely impractical and kind of a pain to use and wash, but that hasn't stopped me from amassing a pretty good collection of them, and using them when I can.
Pin-on--I could never get the hang of these. I have a couple and they never stay up. I'm sure I'm doing something wrong, but they just don't seem to work on my body.
Velco--I never trusted these, since I know that Velcro eventually loses some of its staying power and you have to be really careful that they don't stick to things they're not supposed to.
Pull up--Bingo! These are my favs. I have several of these, but the one I want next comes from fetware.com/driwear.com. They have a nighttime version that I'm just itching to try.
Prefold--Got a couple of these too, but if you're going to go cloth, why sacrifice bulk between your legs where you'll need and enjoy it most?
Other--Ozbub (above) mentioned all-in-one diapers, and I have a few of these too. Not one of them is any good. Since the waterproof pant is attached to the diaper, leaks are inevitable, and the cover will never last as long as the diaper. Not a fan.
My $0.10 (inflation)
-RMS