At the end of the day it will come down to personal preference.
However my take on Thai vs. PI chicks is this (Based on over 500 Thai chicks about 35ish PI chicks).
Thai chicks are cleaner(personal hygiene wise), Are dirtier in the sack, dress better, know how to put on make up properly, and have better hair styles, making them hotter overall imo Are cuter and more endearing, funnier, more submissive(kinda still in the cute category)
PI birds have bulging eyes and look 5 years older then they really are. No wonder they use the word haggered so much here 90% of them look like knackard old ponies ready for the glue factory. Ok I will admit there may be a few rounder bums around but it in no way makes up for the short fall in all other areas.
PI birds have one thing most guys seem to like, they speak english well (for the most part that is). Funnily enough that's also a turn off for me. To me when they rattle on in that sickly twisted American accent I just want them to shut the **** up. Id rather hear the cute soft kahh kahhh from a thai than the twoddle these things come out with.
AC is a very poorly watered down version of Pattaya, it is tame to say the very least. They line dance to 80's rock wearing a bikini over underwear lol wooo how hardcore! There are no lesbian shows, no naked jacuzzi bars, oil shows or any of that good stuff. There are no decent night clubs, no (or very few) beer bars stuffed full of hookers (like Pattaya has in abundance). There are no freelancer/trendish bar/semiclub things like Pattaya has, and now where near as good after hour proper nightclubs either. It doest have anything like soi 6, which is about 50 dirty **** shops with 30 birds in each all in one soi. Where they have your **** out before you even get the beer you ordered.
There is nowhere near the same amount of nice places to eat either, no beach and none of the other 1000 things there is to do in patts if you are bored of in the daytime.
AC is where 60yo retired sexpats go to die.
Oh and it has live poker.
Oh
FYI K2 To **** the hottest birds in BKK will cost you in excess of 10k per pop so doing that for 90 days would certainly hurt the wallet.