SpaceX is going for text messaging, AST SpaceMobile wishes to offer cellular broadband. This means it is probably designed for a higher bandwidth on cellular fr

SpaceX is going for text messaging, AST SpaceMobile wishes to offer cellular broadband. This means it is probably designed for a higher bandwidth on cellular frequencies. Beyond that, bigger antennas mean better signal quality, so a better coverage. Also, Starlink seems to be using an order of magnitude more satellites: AST SpaceMobile is planning a 243-satellite constellation, while Starlink currently has 3000+ satellites operational.