2H tauti does not have the pve damage bonus and you are forced to play with dark element (not the best one for pve because many mobs have high dark resist). I had both, now playing with a non augument +12 bloody retri with feoh SAs and is the first time i am hitting more than with my bloody bow (Yul SAs) that had +70 attribute element on augument and plains of lizarmen buff.
If i had to give an estimate of damage ouput of your summons with weapons
+12 bloody retri > +12 bloody bow > +9 bloody retri/enhanced shadow retri > tauti 2H/ +12 blessed apo 2SA
Still on some mobs i saw better criticals with the 2h tauti than with the enhanced, but probably was the atribute element defense of the mobs
On this update wynn damage was greatly increased and is nice, i think pdef of the summons increased a little to or maybe there has been some change in the damage formula.