I if I had to guess if any of the aliens had more dangerous blood than others, I would suggest the Queen.
1. As evidenced in AVP, the Aliens bit HER and not themselves to release her. Logically, since everything on her is scaled up in terms of size, power, armor, logically the acid would also be more potent.
Otherwise they would have bitten themselves and let the acid drop onto her constraints.
Or
2.Either that or they are just pissed off and would rather bite "mom" than themselves, and all the alien's acid from hugger to Queen is all the same.
Take your pick, but I would prefer to not get any of the stuff on me, regardless of what phase it is from.