on the basic level all stablecoins are same, that is having $1 value. But going into depth some are centralized, some are decentralized and All are run by different companies.
Also I personally prefer USDT because they have a humongous market cap and the coin that has better market cap is more likely to run in the long term and won't scam even if it is centralized.
I know having stablecoin as decentralized is better but the truth is so many coins came and died in surge of doing that so it is better to just flow with the market and trust the coin that is being trusted by so many.
I was not aware there were so many stable coins in the market because if someone asks me I can only tell them USDT as the better stable coin and maybe go with USDC next.