Definitely the Kel Tech- even though I am Glock-less, the magazines are all over the place, so I might go that way. AND in NJ we can go up to 15 rounds...which Glock mag would that be?
9mm or .40?
If 9mm, you'd pretty much have to get one set up for a G19 to make use of standard capacity 15 round mags. Standard G17 mags are 17 rounds. If you got one designed for those mags, you would be stuck having to use the reduced capacity 10 round mags for a G17. As usual, one set up for a G19 will take all mags larger, but that doesn't do you any good.
If .40, G22 mags are 15 rounders.
As a side note in case you missed it, they make versions set up to take magazines from other manufacturers too (S&W, Sig., Beretta, etc. ?). If you look through the list of options, you may find something better suited.