I don't have any experience with the JetBeam lights, but based on the reviews, images, and specs, I think it would be similar to the Quark AA.
The Jet I Pro is a substantial 1xAA light (bigger than the Quark for sure), and the clip is centrally mounted like the Quarks. The JetBeam clip is S curved, so it's reversible on the fly (the Quark body has to be unscrewed and reversed).
Pocket clips are very much a personal preference, so keep in mind your intended use. Depending on the user, a clip can be more important than lumens and runtime. For some (myself included) deep carry is very important, for others, the "ball cap brim head lamp" is important, so a reversed clip is key. For others, no clip at all is best.
If you intend to carry the light clipped in a pants pocket day in and day out, I'd strongly recommend getting a head down pocket clip that's as close to the tail as possible.