MNSSHP. I've been to both that the MVMCP multiple times (gods, I worked through more then half the MVMCP's last year) and while I love both, I really like the Halloween one better. I'm much more of a Halloween person, because that time of year is much more important and celebratory for me and my DH than Xmastime. Plus, I'm a sucker for free candy and I LOVE seeing the characters in 'costume'!
I haven't gotten to PPP yet, because I thought it might be more for kids. Go ahead, laugh, I'm a Disneyphile and I thought something might be for KIDS and skipped it. I didn't know it had it's own fireworks though - I thought it was mostly meet and greets. Shoulda paid closer attention to the Portal!