My favorites are: binance (although currently i'm not using it as much) coindeal and bittrex.
Try to check Codex exchange mate maybe youll find this good also though they are just a newly created exchange compared to those you have mentioned
On the other hand binance and bittrex are even good than Coindeal
Better option for me are websites like
BuyCoinNow where you can byt BTCs without registration or sharing your data, because of that the whole process is much faster and I feel safer
It's something, cause you don't need your ID or any personal data, but you need your credit card and when it comes to personal data - that's something. There are plenty ways to buy cryptocurrencies these days and buycoinnow is fine, but i'd rather stick to trusted exchanges like Binance, Bittrex or CoinDeal.
Maybe he wanted to keep being private thats why he choose that site since there are no registration involved