Since TT is coming and Masked Marth is likely to be one of the Bonus Allies. Since I don't have any other summer unit, I thought I'd use her, but I'm struggling to decide which weapon to give her, Should I use Sealed Falchion? or should I use Awakening Falchion? Also what builds could be useful in the TT?
I think sealed falchion is the best as it boosts every stat, but has no healing effect like the normal and Awakening falchion refined. Whereas the Awakening refine is great with units who have warping abilities, also synergies with bond skills. IMO, the sealed falchion refine is better.
For TT I pick whatever bonus unit I've got and give them a simple build; they're simply there for the bonus. Priscilla, B!Lyn, and PA!Azura take care of most TTs beautifully. Assuming you can get a mounted healer, B!Lyn, and a dancer, you can do the same.
As for builds, that, too, depends on your team, particularly in TT. Mine runs Sealed Falchion, Galeforce, Reposition, Brazen Atk/Spd, Desperation, Speed Smoke, Heavy Blade Seal. This, however, might not be your best bet for TT unless you run a healer. I've never used her for TT, so I can't say either way.
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