Why not both?
Why does it have to be either or?
Can a team not have both a very good o-line, run game, and defense as well as a very good QB?
I don't think there is a person on the forum that would say "got the QB, alright guys **** it, draft no more, sign no more, we have all that we need"
Everyone wants to build a very good team...everyone wants playmakers, good offensive lineman, a strong pass rush and good run game. I don't know where the idea that getting a QB precludes one from obtaining pieces for the other parts of the team has come from, but it is an odd notion. I do believe that having a very good QB can help overcome some shortcomings of a team and teams who have excellent QB's tend to be consistently good for longer periods of time. What a QB allows you to do, is give you some really solid seasons in between the ebb and flow of the other parts of the team. That is Wilson does in Seattle right now. That was a great team, and it eventually broke apart, but because of Wilson excellent player, they maintain a chance at a playoff run each year, Seattle is on the upswing again and I expect that they eventually make a true run at a couple of super bowls until the current parts start to depart.