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I can't say from experience with either of these, but these are exactly the 2 I want to decide between for my tank as well. From hearsay, they are very similar in terms of behavior...
What size tank do you have, and what other fish are in it?
I've seen a couple Tominis with bright orange that looked really cool. Most of the time they are kinda dull looking (at least the ones I've seen). If I could find one of those, that would be my pick given those choices. I don't think you can go wrong.
Those Momics are very cool!! But I went to the store and they had baby yellow tangs... (I know what your thinking tang police) so anyways. They said that if I upgrade in the future (which I am) that it would be ok so I might be getting a yellow!!!
Not the tang police (had a yellow in a 90 years ago) but a 36 is way to small even for a baby. Just let it sit in a aquarium shop for a month (similar sized tank) and watch how stressed/sick it gets.