I've tried them both. Alphamine provides a much stronger stim effect, energy, focus..ext
Decimate provides a "cleaner" energy feeling. Not to heavy on the stims, body time defiantly heats up. It's a very nice powdered thermo. I really enjoy it when in not looking for crazy crazy energy
If I had to choose one..I would choose alphamine. Just because I feel more "euphoric" on alphamine