Eth Yari
Why?
Cuz you meet the str req using even the lowest +str roll of eth treks (best boots for nova sorc)
81+10=91 str
This exceptional base infinity can then be shared with your other builds. Even if most builds don’t need their infinity merc to actually deal any dmg, it’s nice to have some dmg on it so your merc can leech.
And it’s the perfect base to be shared with a mosaic, your merc ends up with just enough dmg to sustain, but not too much dmg to kill your target as you charge up your skills.
Else… it’s just a question of style preference
D2:R