I think it boils down more to Tucker being bigger / stronger [a muscular 215 to Wilson's 170], and a more developed scorer / true knock down shooter. Which means that right now, he's more ready to contribute day 1, and his offensive skills would go a long way toward providing what we need next year.
I haven't seen Wilson play [other than clips]. I can buy into the notion that he's a more explosive athlete, and that with some refinement offensively that he could be a better player / more highly coveted NBA prospect than Tucker eventually. But I think if it came down to which player could help us the most next year, I think it is Tucker all the way.