How do you choose a service to exchange? What factors do you need to pay attention to? For example: I need to get cash in my city, how do I know which service to choose and which to avoid? 
Binance is the most trusted centralized exchange that you can use if you want reliability because it offers P2P exchange that supports wide range of currencies.
You can use too decentralized P2P exchange if you don’t want KYC. There’s some variation on rates and currency they offering. I still don’t explore much Decentralized P2P because mostly doesn’t support my local currency but I will be happy to try one if given a chance.
To make it simple. Choose the service that being use by the majority to play safe.