Mechanically, and reliability wise, all the cars are practically identical. The Acura's do have a better warranty, and roadside assistance if that is important to you, and generally, you'll have a more pleasant experience at an Acura dealer than the Honda one.
The cars themselves as I said are mechanically very similar, but differ a bit in interior layout, features, options, and how they drive. I also suggest driving all 3 before making your decision.
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Just call me.............Mr Hyde
03 Topaz Blue 540i M-Sport
The TL-S / The 540i