I have tried both but didn’t really stick with them long. Maybe noticed a little difference, I want to try them again and get more serious in the gym. I’m a younger guy 22 years old. I’m 5’8” and 140 pounds lean. I got a lot of muscle to put on. I heard stacking them is good for more endurance and lactic acid etc. Should I use both or just pick 1? my budget is low