Hi Rushabh, Bangkok and Phuket are two very different places so it depends on what you rather prefer. Phuket is a beach town and the perfect place to relax while at the same time enjoying your evenings on the market street. Bangkok will give you more of a big city vibe. But still Phuket is not something to be overlooked. Check out my post where I've detailed my trip to Phuket.
https://www.tripoto.com/trip/weekend-in-phuket-5b950554d2e53
Hey, we offer Bar Crawl every Wednesday, Thursday and Friday or even pool party Saturdays, whatever you want, we can arrange it for you. We work in Bangkok since 2 years and we know very well this place. So if you interested to party with us, let us know. Here is our website: www.bangkoknightlifetours.com Thank you !