...plus
There are far bigger issues to consider which I do not intend to introduce to a public forum
Spraff.
We are talking about a procurement decision and in the absence of a hot war cost will always be a the biggest factor and manpower will always be the biggest component of cost, as every single serviceman and woman is made aware at some time in their careers.
There will of course be all sorts of operational imperatives, some of which may be classified, but until the shooting starts (for real), cost will decide the outcome and it was ever thus.