I agree. There are a lot of options when it comes to adhesives, so how do you know which one to use when????? Here is a list of my favorites and when I use them.
SNAIL Adhesive (#104332, refill #104331): This is my go-to adhesive. I use this to adhere card layers and in my scrapbooking. Basically anytime I have a "2D" project (as opposed to 3D), and I'm adhering "paper to paper". I would say I use this adhesive probably 75% of the time. It's also GREAT for school projects (think presentation boards, or even just gluing little pieces of paper together - like my Kindergartner's homework to cut out these teeny tiny squares and glue them on to finish the pattern, or match the letters, etc., etc. - you get the idea!!!) :)
Mini Glue Dots (#103683): These are my favorite adhesive for attaching ribbon to cardstock and anything metal (hardware, brads, etc.) It's always best to avoid touching the glue dots with your fingers, so I always take whatever I need to stick and have that pick up the glue dot and then attach it to the project. For more tips on glue dots, check out this post.
Sticky Strip (#104294): This is the stickiest adhesive and it comes in a roll. (You can also order Sticky Pages (#114300) which are 12 x 12 sheets.) Sticky Strip is best to adhere paper to paper in your 3D projects. Anything that is a box or a die cut that becomes a 3D project. It's also cool to put a strip across a project and sprinkle glitter or beads across it.
Glue Sticks (#104045): In almost all my kids' classes I'll have the kids use glue sticks. It's a little easier for them to manage and it's as sticky as SNAIL, (but a little wetter), but a whole lot less expensive!!! I also use glue sticks to attach cardstock or paper to chipboard.
Stampin' Dimensionals (#104430): I use these guys a lot, too. But these are almost always strictly for the embellishment factor. Dimensionals do just what they say! They are foam dots that give height to your layers. So often times when I want to raise something up and create more of a focal point, I'll use a dimensional (or 2).
2-Way Glue Pen (100425): This is like a glue pen and I use it almost exclusively to adhere glitter. I'll also use it to attach tiny pieces of paper together (like some of the Sizzix pieces and letters or punches (the Owl Punch comes to mind)).
There are a few more adhesives, but these are the ones I use most often. I hope it sheds some light on what to use when and maybe help you with some of your paper-crafting projects!!
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