From a cash game perspective, I find two good ways to play under the gun. You can either raise high pairs along with some drawing hands (which may include low pairs), or you can sometimes limp high pairs along with drawing hands. I've done both, and which is better depends on the other players at the table.
If I am in a limp-fest style of game (loose-passive), then I would prefer raising UTG. Big pairs don't play well in family pots, especially out of position. This tends to be the case in micro limit games.
If I am in a game with a mix of limpers and aggressive players, I like to limp big pairs UTG with the intent to reraise. You are likely to generate some more limpers by limping UTG, but there is very often someone in late position who will try to take down the dead money or get heads up in position with a raise. So limp-reraising can allow you to generate a nice pot before taking it down preflop. This happens a lot in low to medium stakes games.
If I am in a game with many aggressive players, I'm looking to either raise up front hoping to get a reraise, or I could limp-call and try to win a big pot off of an aggressive opponent who is likely to continue betting with nothing. I don't like the limp-reraise move here, because that's more of a preflop takedown and there's a lot of value in playing flops with a big pair versus an aggressive player who has the betting lead. I don't play in high stakes games, but I imagine this might work pretty well there. The table composition is sometimes like this at low to medium stakes games, and it can also work if there are two or more extremely aggressive players even if the rest are limpers.
That all being said, there is no table where I use just one approach to big pairs UTG 100% of the time. I never limp AA UTG more than 1/3 of the time I get it, even under ideal conditions. I'm only about half as likely to limp KK UTG as I am AA, and I don't really limp lower pairs UTG unless I'm set farming.