When instructors and authors recommend a particular glue in their pattern instructions, it is because they have tried it and it worked. Therefore it is safest to use what they have suggested. However don't let that prevent you from trying new products.
Hypo Tube Cement and Hypo Fabric Cement
Hypo Tube Cement was initially made for watch repair and vintage jewelry. It has a precision applicator and allows for a precise amount of cement to be applied. It also has a fine needle in the cap to keep it from clogging so the whole tube is usable. Because the control is in the applicator, this is a great product for cementing half-drilled pearls onto a post. Use the glue to secure a surgeon's knot inside a clamp. It is also additional security to add a drop to your jumprings after closing them. This glue is best used in small places for fine detail work.
Fabric cement is great for gluing Swarovski crystals on fabric.
E-6000® Adhesive is widely used in jewelry-making. It is multi-purpose glue that is self-leveling and medium in flow. It is flexible, waterproof and dries clear. It is strong but can be sewn through, as an example it can be used to glue buttons on fabric and then sew through the dried glue. Any excess glue can be peeled off. This adhesive works well with leather because it is pliable. It also will not blacken or cloud a crystal. Whenever in question, always test glue strengths.
This glue used to be intimidating because it required two different tubes that had to be mixed precisely creating a chemical reaction that provided the epoxy's strength. Today's epoxy is easier to work with. The tube dispenses the correct amount every time. Epoxy is a high strength glue that comes in a 5-minute epoxy or a 2-ton epoxy which sets in about 30 minutes. When using epoxy it is important to be sure there are no bubbles in the tubes to ensure uniform flow. Be ready to position pieces being epoxied before the epoxy dries. Color may be added to epoxy without affecting its strength. For inlay work, color may be added with wood, bone dust or even kitchen spices.