User blog comment:Lozxs/Help?/@comment-17420927-20160711110509

The best spark lead is Zero, whereas best spark sub is Ensa-Taya.

The bast crit lead might be Mankai Sakura Miku, but the best overall crit unit is probably Avant (though Azurai is pretty good, too).

Without rares/LEs, then you probably want Vern for spark and Avant for crit. Silas and Avani are also decent, but Vern/Avant are top-tier.

Linathan's spotlights  are a good reference point, and their more recent ones also include damage comparisons as well.