[RobNottsUk]

The problem with AAxx in a loose game, where opponents frequently cold call is that you cannot, move them off hands like 23xx. In a tight game, opponents don't like to cold call, so will be more cautious with hands like A4xx and other poor Lo's.

So, when you catch your Ace for Hi, you generally split the pot... Due to loose nature of opponents, you may easily fail to fold correctly, or fold incorrectly as you'll find it hard to know when you're beat.

Many of my opponents overplay AAxx and end up paying off with 2nd or 3rd best hands both ways, in a pot that they ought not to have seen even the turn card.

AA23 on other hand, rather likes a ALH flop, tset + Nut Lo draw. The loose player will frequently overplay 2nd and 3rd Nut Lo's, generally putting you on A2xx.