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i'll tell you, i own JJs and i love em. i think the jjs r wider in the tail (the 4th dimension) but the s7 r wider overall. pretty sure the jjs r lighter, theyre waaaay ligher than my chopsticks and THA 187s.
just so you know, with the 5 dimensions they ski "shorter"... where the contact point to flat ground is much shorter than the actual length of the ski. with this in mind you could essentially go with the longer size because itll still carve like a shorter ski. the jjs r lighter so that might help u make up your mind
just research the two, compare the dimensions to what your used to and/or enjoy, find the cheaper of the two, read one of the million jj threads on here, etc etc
either way u'll have fun in pow