Anadraulic State GT is, IMO, the best pre-workout performance enhancer available.
Anadraulic Pump IS a pre-workout, but not to the same degree as ASGT. I use it when I need to get in a late night session and want to go to sleep right after training. Geranium is the only stim in Pump, so it doesn't get me wired, which is perfect for late sessions.
The main difference is ASGT is an all-around performance enhancer, including but not limited to, a creatine complex, adaptogenic matrix, testosterone boosters, stimulant blend, and an estrogen control complex. - AP is geared more towards pumps and focus.
Stacking them is great, but if you can only go with one, absolutely, without a doubt go with ASGT. You won't regret it.