There are many good exchanges. You can choose any according to your country or need,
Every person in this forum can only suggest their fav exchange according to their experience. one exchange can be good for someone and bad for the next person.
I don't rely on specific exchange tbh. For bitcoins purchase; local bitcoin looks perfect to me and my fav, but recently I heard some complaints about localbitcoin, unfortunately, can't verify with 100% accuracy because I didn't face any issue yet. So one must do their own research too.