I have both, and rarely use the JT one. It is a bit taller but shorter, so I'll grab it if I've got some longer cuts to make. I like to stack up what I'm cutting and find the stripology stays put better. Paired with the Martinelli cutter, I can cut multiple layers even when there are seams. though I will stack so the seams nest a bit so it lays flatter. That cutter has more exposed blade so it does not end up riding on the plastic instead of cutting. I can't use the Olfa cutter on more than one or two layers, the Fiscars is in between. This pic shows the amount of exposed blade between the Olfa (yellow) and Fiscars cutter.
