Bro, I would suggest you go with NAPS every time. You're already at the right place. Belive me, there are pros and cons with every source but that other guy has proven himself to be nothing but trouble in my experience. 

I'd suggest you check out the other questions here in the QA, as there are a ton of first timers, that have asked questions that will benefit you. Check out my suggestions on first time cycles, how to control estrogen, and very important, PCT. Have all of your bases covered going in. Your coach may know a lot and may be helping you well, but you want to know these things for yourself and not just put blind trust in them. Have all the knowledge you can and that way, you can own your decisions and make the best gains!!!

Best of luck, buddy!