I used to use the gel but find that I get the best results with Locktite Professional Liquid.
To me the main difference is the "Professional Liquid" holds stronger than most industry specific fletching glues but can be applied extremely thin on the quill a little more evenly than the gel type glues. As long as your fletching jig is set up properly you should have nearly full contact on the entire quill to the shaft so you don't really need any excess glue to fill the gaps so to speak. With the gel type glues the glue beads were hard to keep consistent across the width of the quills for me leaving a heavy bead on one side and almost none on the other at times, this caused any excess along the edge of a quill to squeeze out the side when clamping it onto the shaft making for less clean glue lines along the quill. However, with the "Professional Liquid," you get a super thin, super even glue line that spreads out more evenly from edge to edge across the quill because it's thinner and less viscous and it sets up in about 20-30 seconds.
The 20-30 seconds of set time is just about the right amount of time for me to glue one fletch and then get a second feather clamped up in my second clamp. I run one jig with two clamps and just kind of take my time through the process. I'm not sure I could work significantly faster unless I had a lazy susan set up with 12 clamps and just whirled it around through a whole dozen at once. However, that would cost a small fortune to set up and only be used every now and then, so I'm ok with my moderately efficient one Bitzenbarger jig with two clamp method.