If you're trying to match tanks, the two best Dragon tanks are very late, post OIF invasion tanks. The Trumpeter kits represent tanks that came into service just prior to Desert Storm thru the 1990s (Balkans, Kosovo, etc.). Tamiya's original M1A1 is a good representative of some of the initial batches of M1A1s, most of which went to Desert Storm.
Best to find out what type of M1A1 they use.