OL - 2019 (I think the OL is younger than the 2007 OL so I'd give them the edge)
WR - 2019 (2019, not even close)
Woah.
The 2007 OL is one of the best all around units of the free agency era. This is some serious disrespecting of that unit. The 2007 unit would win at LT LG and C by a lot. RT would be a push, and while RG would go to 2019, Stephen Neal was a great player in his own right.
As far as WR -- none of these guys are as good as 2007 Moss or Welker. Whether or not the offense matches up as a whole is another issue. The one edge I would give to 2019 here is that they don't need to be as one dimensional as the 2007 team -- Gordon and Brown both have way bigger route trees than Welker or Moss, but they're also just worse.
I think time has made us underrate that 2007 team. They were one more play from being considered probably the 2nd greatest team in sports history after the 92 Dream Team. 2019 might be amazing, but c'mon.
The RB is way way way better in 2019 though. Sammy Morris and Laurence Maroney wouldn't even make this roster.
This offense won't be as explosive as 2007. It can't be. But it might be more versatile/consistent.