Tough one. Data, I think, is more capable of on-the-fly, adaptive, tactical thinking. On the other hand, the TX can change appearance. On the other, other hand, she'd have to have her plasma cannon sheathed then, in which case Data, with phaser already in hand, would be the quicker draw.
With a disguise, she might be able to draw him into h2h, but I don't think she's significantly stronger than Data, and he may be a more skilled fighter.
H'm. Gonna go with the Datameister, but it ain't gonna be easy for him.