Kan 5. Qd3 or Qf3?

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IHaveTHEChessSkill

 Qf3 aims
for g4 push, both could transpose with e4 c5 nf3 e6 d4 cxd4 nxd4 a6 qd3 nf6 nc3 qc7 qg3 or a6 qd3 nf6 nc3 qc7 and a choice between g4 and qg3.

Chess_Player_lol

I would play neither, but if i had to choose one i would go Qd3

tygxc

#1
Qd3 obstructs the diagonal of Bf1 and Qf3 obstructs pawn f2.
Both commit the queen too soon.
What is wrong with the simple 5 Nc3?