The V15 is smoother than the 1042. It might sound a little dull when run through tube gear. Depends on your preferences. If it were me, I'd buy both. The V15 in particular has very strong resale value so the cost to try both and sell one is relatively low -- you might lose $100 or at worst. If you have two armwands, it might not be a bad idea to keep both on hand: the V15 for bright recordings, the 1042 for more neutral sounding ones.
Good luck!