If you mean something like Changenow or Changelly, then, of course, I would prefer the exchanger, since they do not hold my funds (I do not create an account.) On the other hand, if you mean KYC, as it is on Binance or Bittrex, I would prefer Changenow, since their rules provide for KYC for exchanges over 11 BTC. However, all services must be approached with caution, only this way you will be able to save your funds.