What up Wharton. It depends on what you guys mean by playing better. Also, when considering the Moss/Welker factor, we should also include the Brady factor.
Playing Better:
On the surface, I could see why some would say that AR is playing better than TB, however, if you look at the two closely, I don't know if it is that clear cut. I tend to look at the quality of defensive competition and how the qb's are being played by the top D-coordinators.
Brady has played against Pitts (Lebeu), Jets twice (Ryan), San Diego (who's d was ranked 1 last yr, Pat played them out of the gate), Dallas (Ryan), and the Giants. Each of these defenses go out of their normal defensive rythms to taylor there d's specifically for Brady and the Pats offense. So every time Brady plays a top d or any d for that matter, he is facing exotic fronts, or schemes that have never been used before by that defense (see Pitts). Yet in the face of these defenses Brady has lead his team to the go ahead td to win the game (except against Pitts, where he did not get the ball back), whether his teams D holds on to maintain that lead is a different story.
AR has faced the Chicago Bears thus far this year. That would be the only D that I would say is top notch. I have yet to see AR face any exotic defenses that alter the way they play to stop his offense. So, although he is having an overall better statistical year, I would not necessarily say that he is playing better.
Moss, Welker, Brady
We all know the story, Moss was washed up, nobody wanted him, the Raiders got rid of him for a mere 4th rd draft pick. He got with Brady, the rest is history. How many of us knew that Welker had been released by two different teams before he came to the Pats? He was first cut by the Chargers, who had heard of him? He then was released/traded by the dolphins, again, who had heard of him? He got with Brady the rest his history. The point, it could be argued that Brady is the reason that both welker and Moss had those great years since 2007. It all depends on what you see.
As far as bettter weapons, in 2007 (their first season together), Brady had Moss, Welker, Gaffney and Stallworth, RB Maroney. AR has Driver, Jennings, Finley, the 2 other receivers, who's names escape me and a superior RB (by the way, you can't double team any of these wr's because they all are above avg). I would say that AR has more weapons than TB did in 2007.