Personally, I’m most excited to meet Fifteen. Every promo pic of him makes him look cooler than the one before. (If absolutely nothing else, he has fantastic fashion sense-- guess the reason all the other Doctors were so fashion-oblivious was because he was hogging it all for himself, lol.)
I think Moffat’s era is sort of bowl-shaped in quality. Seasons 5 and 10 are amazing, 6 and 9 are great, and 7 and 8 are a bit uneven. If season 8 was excluded from Capaldi’s run he’s easily be the best Doctor ever.