It really depends on the kits you are comparing.
I have quite a few of the "shake n bake" kits here,,,,but, that is because if you put the Tamiya Skyray next to the Airfix/MPC Skyray, you are going to want the Tamiya. The same thing happens with Tamiya and Airfix/MPC or Revell Corsairs, The Tamiya is head and shoulders above the others. This is the pattern as long as the Tamiya kit is an original Tamiya, it only sometimes applies to the Italeri kits in Tamiya boxes. An example there is that the Tamiya/Italeri Intruder far surpasses all except for the Fujimi kits, Revell and Hasegawa kits aren't even close. But, the Fujimi, Esci and even the new tool Airfix Skyhawks are better than the Tamiya/Italeri Skyhawks. (if someone claims that Esci and Italeri Skyhawks are the same mold, they have never seen both of them)
So, as we always end up saying "it depends"
Rex