Besseys are the original, but Jet introduced a knock-off with minor improvements about 8 years ago. I have both, and certainly am not going to get rid of my Besseys, but if someone offered to swap them even for Jets, I would! Keep an eye on pricing as both are very good and a good sale on either makes for an easy decision.
https://www.amazon.com/s/?ie=UTF8&k...targid=kwd-10736157713&ref=pd_sl_3ga43ujr1v_b
http://forums.finewoodworking.com/f...eral-discussion/bessey-vs-jet-parallel-clamps
The trigger clamps are very useful as you probably use both hands when assembling/gluing a join, but assuming you can hold it steady with one hand and had the foresight to position the clamp within reach, it is a one-handed job to get the clamp in place. I don't find the heavier trigger clamps that useful because they are, well, heavier. But YMMV depending on your methods. The 6" trigger clamps are especially useful for me. I really only use the trigger clamps to hold things together while I am verifying everything is square, and use "real" clamps for locking in the position and letting the glue set. If the material allows screws, they are my favorite clamps - "glue and screw" is hard to beat for a good bond (but I still use the parallel clamps to set position before the screws).