Aces are better. Here's a sim for the suited low hand HU vs a range of typical low hands with at least one wheel card, which includes small rolled trips, suited and unsuited 3-straights, small pairs with a low card and another pair of Aces with a low card:
Hand | Pot equity | Scoops | Wins Hi | Ties Hi | Wins Lo | Ties Lo |
---|
3dAd8d | 54.42% | 210,002 | 329,424 | 149 | 208,262 | 842 |
$L$L$W | 45.58% | 157,035 | 270,427 | 149 | 189,477 | 842 |
Here is the sim for AA8 offsuit vs same range:
Hand | Pot equity | Scoops | Wins Hi | Ties Hi | Wins Lo | Ties Lo |
---|
AcAd8s | 62.35% | 281,469 | 438,611 | 59 | 77,496 | 218 |
$L$L$W | 37.65% | 133,302 | 161,330 | 59 | 209,198 | 218 |
Quibble about the range is that it includes hands like 872 offsuit, but it's difficult to quickly express a more discerning range. This should do for comparative purposes.
There's a slight playability advantage for the suited hand, in that you can brick off against a low card and fold easier, though mitigated because you can also catch a suited banana and get to the river with a draw you can't fold but fails to improve.