... V'Lar had much more experience with aliens than T'Pol. V'Lar was a diplomat with a forceful presence. T'Pol was a science officer ...
... She is clearly the more superior choice for Science Officer.
Well, yes. But why is it that Vulcans can only be science officers? I was speaking of an ambassador/liaison type role during encounters. If you can only accept Vulcans as scientists in cat suits then maybe there is nothing else left to discuss.