I'd not choose what you buy based upon future sale but if or when you sell it you'll have a much smaller audience, but when you find 'the guy' who wants the supercab he'll have fewer choices.
Yah, doing a trade in on my 2011 supercab for the 2018(if it can ever come in) when we were discussing what they were going too give me for mine he said hard to tell what there worth because there are none out there to compare to. I told him there you go it's are rare truck and you should give me more. He laugh and said that's not how it works.