[Ray Of Light]

It depends.

In a tight shorthanded game, where most pots are heads up, and a raise will likely gain me position in the hand; I will raise low suited aces UTG.

In a loose shorthanded game, where raises are often CC, and pots are often multiway, I will limp low suited aces, if a player has limped in before me.

I would NEVER open limp with them though.