Nah there is no difference between BUSD and USDT.. Both are stable coins but I prefer USDT because of course this coin is the most popular of all stable coins and it seems most exchanges has USDT while BUSD listed only in Binance Exchange I guess.
if you are a day trader on binance then you will love BUSD. in terms of value, there is no difference. but I think BUSD is a favorite for Binance members.
Moreover, the USDT problem lies in the transaction fees. not to mention that there were bad issues related to USDT. Even though USDT is already in the TRON chain which is a costly solution from the ethereum average, I myself still choose BUSD.