Personally I feel too much is made of the crop factor, whilst it does give a reach advantage over full frame it is (in my experience) rather less than the 1.6 crop factor would suggest.
Likely because the reduced field of view is not what made 'crop factor' valuable, but the higher pixel densities of the sensors to date. The caveat is pixels don't matter near as much, as they are getting to very high values (and that might give a preference to large FoV a bit more leeway/ less consequence?)
Take the nikon 810 (for heresy and example, I shoot canon though). A 36 MP full frame, if scaled down to canon APS-C, is ~ 15MP (area APS-C, 329mm^2/ Area FF, 864mm^2 * 36). In that case your 'crop factor' advantage would be the difference in MP, proportionally, not your field of view, as that is what influences you photo.
That is how I look at it, anyway. If a FF sensor had 2.6x the pixels the 2 could theoretically be entirely equivalent / irrelevant (assuming identical performance).
Edit: So I guess you really need to ask yourself, do I need the extra pixels, then your decision is made.
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