E-6000 is our most popular glue, since it works for so many types of bonds, and doesn't require any mixing.
For the
strongest bond, in an area that won't require any flex, I recommend
2-part epoxy. I'm partial to the Rings & Things 24-hour epoxy, since I have some earrings glued with it in the 80's, that are still holding together! However, the Hammerhead epoxy is also very good, and doesn't require measuring (due to the plunger dispenser). The Epoxy 220 and 330 are nearly as strong as these 2, and have other specialty niches.