I have both. I copie and paste here what I wrote over at the group.


Couple of notes about differences between the leo and m1a2. The Leo
comes completely assembled with decals on. The m1a2 you will need to
assemble some minor parts, (machine guns, tow hitch) and you get a
small selection of stickers to choose from. My desert m1a2 was a weird
dark tan color, I had to repaint it with tamiya light sand color spray
paint.

The abrams is a bit slower than the Leo, I think this is probably due
to different size drive wheel. The abrams handles obstacles better,
it's front is sloped like the front hull of a boat, so it can climb
over taller rocks than the leo can. Also the leo has rigid mudflaps
(just like real leos) which bang on things as you are climbing over
them. Also the rigid mudflaps will prevent you from climbing over
things in reverse sometimes. The Leo has headlights and reverse
lights, the abrams doesn't have any except the coax mg LED. I think
tokyo maruis tiger does, but I'm not sure.