What Quiverbow weapons are worth using?
It depends. If you have Difficult Life enabled, then probably none of them; you will want to be able to fly, snipe at long distance from elevation with a laser rifle and avoid melee with blights at all cost unless you are in endgame armor with other forms of protection (specifically anything that will save you from insta death from armor penetration).
If not, pretty much any of them will do if you have the infrastructure to support their ammo requirements. The Soul Cairn is a somewhat expensive replacement for a MFR Safari Net and launcher (did not appear to work on Endermen in creative, though). The top end crossbow (I think its the Improved Auto Crossbow) works fine, but its range is pretty short, especially if you are used to Tinkers projectile weapons. There are several machine gun equivalents that spam great amounts of cheap ammo in a satisfying manner, though they need time to spin up and do not do much damage, though their knockback ability has some utility in certain situations.
Flaxbeards weapons are fun, once you get the ammo sorted out. You can get infinite gunpowder either from cobble (Mekanism crusher, cobble to gravel, AMT Jaw Crusher = Gravel to Flint and Sand, Mekanism Crusher will turn the flint into gunpowder, AMT Jaw Crusher will turn sand to clay, EssentialCraft Mithriline Furnace will turn clay into gunpowder), Matter Overdrive, EE3 or, of course, through a creeper or witch spawner. You can user iron, silver, lead or steel nuggets to make the musket cartridges. I know a flintlock musket will one shot most mobs other than zombies (though it will occasionally do so with them also), and with the spyglass upgrade you can do it from a great distance away. Makes a great big boom, too.
The ES3 guns are interesting and powerful from playing around with them in creative, but I do not know enough about them to compare them to other weapons in terms of ease of maintenance/infrastructure required.
The Mekanism flamethrower is also great fun, but it will destroy blocks.