I see
http://preev.com/ has different sources as input for the exchange rates, as far as I can see, kraken/bitstamp have better rates than binance or other p2p services including localbitcoin.
The bigger volume, the better price for you to choose to enter and exit. Low volume exchanges have big difference from sell to buy orders.
With P2P trades, it is impossible to find best suggestion from preev.com, you need to choose some P2P marketplaces and visit them to find, filter and get the best offers for your trades. P2P trades are risky and you must beware of scam with "too good to be true" offers. Don't find too good rate offers as they are scam trades if the offer owners are new users.
why most of you recommend using binance for buying BTC?
Binance is a big exchange and has a good reputation. They also responded too good for a hack with their compensation for customers
Hackers Steal $40.7 Million in Bitcoin From Crypto Exchange BinanceThey provide you some methods: Bank deposit, credit/ debit card, P2P trading, Cash balance, Third-party payment.