The DML Abrams kits were the best, but the Trumpeter ones are very good. Only shortcoming is the front of one of the turret faces. It angles upward instead of being horizontal. A wedge of sheet styrene is requied to truly accurize it.
The DML kits are a fidgety build. I haven't noticed a DML vs. Shanghai quality difference. Single link track is a turn off to some builders.
DML has a variant with a rudimentary interior and a real nice crew.
The USMC M1A1HA has wading gear and IFF panels as well as USMC smoke grenade lauchers.
The Trumpeter kit comes with both one piece vinyl and link&length tracks (you get two sets of track).
Trumpeter also produces the only one with a mine roller.
Both make one with a mine plow.
Some of the Trumpeter kits come with a motorization system.
Eaiser to build.
Bottom line, if you want an interior and crew, look for the DML kit. Same for a USMC variant. First tank you're ever building, go for a Trumpeter kit.
If you want an M1A2, I just got Italeri's M1A2. It is a great looking kit.