So I'm having trouble deciding between the two. In the next couple of weeks I will be buying one or the other. I've shot both and thoroughly enjoyed them both equally. I will have a budget of, at most $500 - $600. I've never owned an AR or a pistol caliber carbine. I am a Glock guy and I do like the compatability factor with the Sub 2000. I also would like to dive head first into the AR world. Since my budget is so low and I'll be learning with this, my first AR, I've read that the M&P Sport 15 is a good start. I've also contemplated buying a complete upper and complete lower and just throwing the AR together myself. But with a budget of $500 - $600...I don't know how possible that really is. I'm not opposed to buying new or used in the INGO classifieds (or even Armslist). I more than likely will not be buying straight from PSA or Gunbroker, etc. I will be doing FTF transactions through private party sales or at a LGS. I know that if I get the Sub 2000 that it will stay in "my arsenal" for a long time...and counter to that I've heard that getting my first AR might create an addiction that won't stop with my starter rifle lol. I'd like to get some advice from camps on one side or the other. Or especially from someone who has both...and/or hypothetically if you had my budget and was to buy either one...which would it be and why? What Say You INGO??? thanks.