The reason I prefer Smooth On is that it's a more versatile glue, in my opinion. I use it for gluing up glass/wood laminated bows, overlays, building up risers with wood, or wood/glass combos, Z-splicing wooden billets, bows backed with bamboo and hardwood, horn/wood composites etc. It will do what Unibond will do, what Titebond will do, what Resorcinal will do... and a lot more.
Additionally, heat corrections can be made to the bow following glue up, for alignment purposes and such, without ill effects.
I have other glues here of course and rely on them for certain applications, but use Smooth On 9 times out of 10.