I would lean towards Culpepper unless they go into the season with Marcus Robinson as their #2 guy. Culpepper showed me last preseason, that he has matured past the "throw it up to Moss" mentalilty and that he is an elite QB on his own right. He doesn't need Moss to throw for 4000+ yards and 30+ TDs as long as he has two competent WRs (Burleson + ?)
And while McNabb has the elite WR in TO, outside of Brian Westbrook, there aren't many other receiving threats in Philly. Maybe if LJ Smith develops into a premier pass-catching TE... I still don't see McNabb reaching the 5000yard or 40TD mark in that offense....in other words his ceiling is not much higher than 4000+/30+ as well.
The value in drafting these guys though comes in their rushing ability. Culpepper could become the #1 goalline option in Minnesota now that Moss is gone, racking up an additional 6-10 rushing TDs. While Philly seems more content giving the ball to the RB when it's short and goal. Remember Minnesota didn't have a RB touchdown until like the 8th week in 2004? In 2003, Philly had something like 20 rushing TDs and in 2004 they brought in Dorsey Levens specifically for short yardage rushing situations. Buckhalter (8 TD, 2003) will be the short yardage RBBC guy in 2004.
I will only rate McNabb higher if it's apparent that Culpeppper doesn't have a decent enough set of WRs that he can post top10 QB passing numbers..
Probably won't draft either one unless they fall to the third round though.