Disadvantage off the top

[Dopple]

I am thinking of going to a higher bet off the top in DD but I have heard you have a disadvantage. I wonder if the disadvantage off the top is for a non counter or an AP. If you have seen a few cards some index plays come into effect.

 

[blackjack avenger]

Less but Not Equal

One would still be at a disadvantage even with indices
only:joker::whip:
less so