well JJ is a LHW whereas Spider is a MW, although it's very fair to say that they could fight each other at a catch weight, that'd be an epic fight on untold proportions
neways, we got spider.. the best pure striker ever in the octagon, using angles and just ridiculous accuracy ; then we got JJ - very unorthodox striker but mixes elbows and crazy moves out of a video game better than anyone these days
JJ been dismantling fools and basically has almost run through the division once he beats hendo (if) then ya he basically cleared the division, he has insane long reach, crazy athleticism and is a beast
Spider is probably the most talented MMA artist ever he has black belts in multiple disciplines Judo, Tae Kwon do, BJJ, and an expert in Muay Thai, plus he has a yellow rope in capoeira, the boy is bad no bones about it, he's undefeated in the octagon and basically hasnt seemed to be very interested until Chael lit a fire under his ass
JJ is definitely the future, and might go down as a GOAT when it's all said and done, Spider is the present/past and is as of today the GOAT (with honorable mention definitely to Fedor)
that help?