Binance seems to be the most trustworthy exchange that has also become the biggest one. It has been tried to hacked and scammed and phished but no matter what happens they always keep it secure and you always have your money there. I usually do not hold much coins in any website and try to keep them on my ledger however if I had to keep a big amount of bitcoins or any other coin in one website it would be binance.

Plus, considering they have bnb which is used for fee's which makes it even lower fee, their commissions are really small compared to other websites as well. Plus they have affiliate which means you can invite your friends and make money on their trades as well. The amount of positive things they have doesn't stop.