What platforms can I buy stable coins from?

You can buy stablecoins from almost every centralized and decentralized exchange there is. This includes Binance, Coinbase, KuCoin, Nexo, and many others. There really isn't a way to compare them to ensure that you're buying the coins at the "best platform". When looking at a platform to buy stablecoins from, you should go with big & reputable platforms that have been recently audited, so you can be sure that you won't lose your money.

As long as you buy them from a reputable platform, it really doesn't matter. You should look more into the fees and go with the platform that will charge you less for purchasing them with your local currency.