a casino offers you the ability to split aces for double, so if you bet $5 then you can add $15 when you split and now have $10 riding on each ace. They also offer the ability to resplit aces, but if you split aces for double you forfeit the option to resplit. THe game is ENHC. Should you always split aces for double (except of course against A which is just a hit) or should you retain the option to resplit against a 9 or T?

My guess is splitting aces for double is better, because re-splitting while great is rare.