It depends on CEX or DEX. You need to be more precise.
CEX:
Binance
Coin base
Gemini
FTX
DEX:
Uniswap
Pancake swap
Sushi swap
1inch
On DEX.
I mostly use pancake swap these days. I think that it's a good dex that's running on BSC. I've used uniswap before and I don't like to take those fees right now.
That's why choosing pancake swap is good to me and advisable if you're trading bsc tokens.