Just a few words as I did not extensively compare the two:
The Momentum seems softer (more like the P5) but has 'normal' highs vs. the TMA-1 cut off just above 8kHz and are somewhat coarse with the sound being only in your head (i.e. no space).
At the lower end the Momentum seems to offer a bit better resolution, though both are a bit too fat. Extension could be better on both.
Keep in mind that I only use them with EDM (and not Vocal House at that
, so I do not care much about things I'm looking for when using speakers (where I mainly listen to classic, jazz and older rock), so while I do prefer more neutral sounding headphones like the DT1350 the Momentum is fun to listen to and quite well suited to my mobile taste.
Should I want to listen to other genres than EDM choosing between those two headphones I'd pick the Momentum over the TMA-1 any time. Not to say there aren't better solutions available...
Nevertheless I'd consider the TMA-1 to be more robust... which is definitly a plus for its intended (DJ-) audience.