Some exchanges focus their development on the IOS and not android. I know of apps that works better on IOS than android. I don't usually trade much with my mobile phone so I won't have much thing to say here. When I want to trade, I make use of my laptop because it gives me a better view of the charts and getting a better understanding of what I'm trying to read. From past experience, android apps don't have a fast responding system as it always hanging when it's being used more frequently or other apps are running in the background. For the best user experience, Bybit is a good choice for those okay with trading on centralized exchanges.