For a 15/12-ish player, the only likely hand to open UTG with an 8 is 88. Assuming he's opening less than 12 from that seat, his tentative range is something like 88+ AJ+ KQ and maybe KTs+

JJ is likely 55-60% against this kind of range, and with position plus the prospect that if I call, the majority of flops will have at least one overcard, which means they fit his range much better than my JJ, I lean toward 3betting pre.