Stay around this side of BangkokIf more of your shortlist points here, compare Chinatown / Old Town as a base.
Rajadamnern Stadium Fight Night is one signal, not a reason by itself to choose a hotel. It sits in Rajadamnern, and RJNS currently gives Chinatown / Old Town the strongest stay fit for this stop. If more of your saved places cluster on this side of Bangkok, the area becomes more useful as a base.
Best when most of your saved places are around Yaowarat, Song Wat, Pak Khlong Talat, Nang Loeng and the river-side Old Town.
Best forHeritage + foodGetting aroundMRT + river boats; weaker BTS coverage