I'm going to come down on the side of UTG opposed to he blinds. My reasons are :

1 UTG doesn't have any forced bets.

2 SB/BB have forced bets.

3 UTG doesn't have any forced bets

PT actually shows UTG as the most profitable position for me (or one of the most), but I play 6max. The blinds just plain suck, being forced to bet a big blind with 72os is just sick :P

6max games are strange though as the positions are only UTG UTG+1 CO Button SB BB. So even UTG is similar to Middle position in a full game with how many players are left to act.

This is my Limit SH perspective.