I'd say +atk -def.
A lot of the time Lyn just doesn't deal enough damage, and her speed is already great as is (+9 from both effects) and you could give her a speed +3 seal
However, if you're willing to keep flashing blade on her, you could give her a strong special (luna, glacies, maybe even aether) and have a lot of damage or sustain come from the specials. So if you want to do that, +spd is the way to go.
tl;dr +atk is easier, +spd allows for fun special builds.
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