UTG and the blinds are completely different situations. From the blinds I am more likely to play middle suited connectors and gappers along with small pairs against several limpers, or even a small raise. Pot odds
alone make those hands profitable. High unpaired hands are too likely to be dominated.
I'm likely to raise 3 to 4x BB against one or even two limpers. If anyone hangs around check. Your almost always looking at a pair. Most other hands would have raised pre-flop or folded post flop.
UTG you just cannot restrict yourself to AA-QQ. I step in with 3xbb with any top 10% hand. Unless I'm out of position against more than one caller I'm going to bet-out on the flop almost every time.