That’s a deep rabbit hole! The difference usually comes down to 'touch-first' design and the way we hold our devices. There’s an excellent analysis of this exact topic right here https://gorillaoverview.com/why-a-strong-game-hub-feels-different-on-mobile/ . It explores why a mobile hub isn't just a shrunken-down version of a PC launcher, but a completely different beast optimized for thumb reach and haptic feedback. The article really clarifies why the visual hierarchy in a mobile hub is crucial for keeping players engaged without overwhelming them with too many menus.

Hello Navjot,
Yes, I provide design services as well as printing. If you'd like to meet for an in-person meeting, we can do that, but it will have to wait until after the holidays as my schedule is extremely busy with family events and other meetings for the rest of 2014.
Matthew Gorton
printedsolid.com