two different chemicals completely. I once was like you, had the substances but not the knowledge. I have ran deca and sust by them selfs. Deca is great, the best my chest has ever looked, was when I was on deca. The sust is ok, I get good gains on just 250 a week for 12 weeks. The two together would be ideal. I know it is your first cycle and you want to see how you respond to the two, but I would run them together. I would run them both 12 weeks 250-500mgs weekly of the sust and 300-400 mg weeks of the deca. I would get on ancillary guys, and get two bottles of nolvadex. Run 50mg a day for 2 weeks and 25mg a day for four weeks, three weeks after your last injection of sust. I would really try and get some hcg for your pct too. I had a tough time with recovery on the deca. What are your goals deca/sust stack is going to give you 20-25 lbs lots of stregth, and a big round look. I mean your muscle will look really large, and curvy.