I've managed to +10 Marth, Raven and Nowi and have no started to think about my next project. I recently pulled a 5* Libra (+def/-spd), and have been sitting on a 4* version with +spd/-hp. I also have a -spd Kliff waiting to martyr himself for Fortress D/R, and I think Libra would be a great beneficiary as a mixed tank. With boons effectively getting taken out of the game with merges in an upcoming update, my choice now is basically if I want Libra to go +spd or +def. I need your help to decide.
Now, I could go speed boon, def refine and the point is moot, or I could go for broke either way, which gets him to (with boon, refine, Fort D/R, +10) either 42 S/ 38 D/ 39 R with speed boon, or 36 S/ 45 D/ 39 R
Otherwise, with speed boon/ def refine, that's 39 S/ 42 D/ 39 R.
Any input is appreciated.