trading on one or two exchange-known enough to be able to get profit in my opinion because the exchange really reliable and well-known is the best option to secure the valuable assets and trading safely to get the profit that real binance and okex be choice my for trading long-term.
Add more exchanges to your list like Kucoin. In particular, you will use Kucoin exchange in a few months. I know Binance and Okex exchange have high TPS but for a short time we can use the top 10 exchanges. For top exchange, you should follow the CoinGecko website. By gathering all security, TPS and trustworthy one exchange will become a good exchange.