OYYYY....That's a toughie!!! I've never usedMAC's P&P, so I really can't judge on that, but I LOVE MAC Paints, and really like UD PP; so it's a toss-up...but if I HAD to make a choice...MMMMMM I'd say MAC Paints (Stilife is my all-time favorite!) rate #1, with Urban Decay's Primer Potion running a very close second!
Out of the three, I've only used bare canvas paint as a primer, and it does absolutely nothing for me. I am so going to buy the highly recommended UD PP next time.
MAC Paints are my HG, specifically Sublime Nature. UDPP did absolutely nothing for me, didn't keep e/s from fading, didn't keep it on longer, and made blending absolutely impossible.
I wish it had worked, since everyone else loves it!
I use Lise Watier Lip and Eye Primer, and shadesticks. My shadow sticks pretty firmly as long as I don't get myself into a sweat. And even then, it's not bad.
Umm...well seeing as I have never used UDPP or MAC Prep & Prime, I would have to say paints but, I do plan on trying UDPP just cause everyone seems to love it. Mac Bare Canvas works good for me but lately I have't been liking the texture if leaves. Sometimes it looks as if my eye lids are dry which isn't the case. Maybe I should hurry up and get the UDPP lol.
I'm glad everyone is saying UD PP is good cause I just bought some while I was at Sephora today and wasen't sure if I'd like it (I usually use TF First Base but they didn't have any). That makes me feel better!