Another thing is the way Magnet moves and resizes windows seems to create less visual 'flashing' than Rectangle's method, for instance Rectangle will resize, then move, then resize again when maximizing a window, which can create a really pronounced 'flashing' effect. That's not to say Magnet has no 'flashing' ever, there's certain situations where it does and to my understanding it seems necessary due to the limited nature of moving and resizing windows on macOS (I guess you have to do one then the other and can't both move and resize simultaneously?), but to me Magnet's methods often look visually better.
Rectangle is great though, I've switched to it from Magnet and these are just some minor gripes.
