ATG for almost everything--glue dots for buttons and ribbon, xyron for die-cuts/titles. I only use liquid glue on rare occasions such as small pieces of chipboard or when I don't feel like running one or two small things through my xyron X.
It is very easy to use the ATG and not messy at all!
I use my ATG most of the time,,,,,,,my second new fav is glossy accents for things like buttons, chipboard or paper that the ATG doesn't like like highly embossed or glittered paper. I also use sticky tape (double sided tape with a red skin you peel) for ribbons and lace.
I have a GlueGlider Pro and is it okay to say that I HATE the dern thing?! I do like glue dots, regular glue, and double sided tape. I had a little, fit in the palm of my hand adhesive thingajiggy once that I really liked a lot. I don't know why I have such problems with the GlueGlider Pro...perhaps I should stick with Elmer's?!
I love my ATG and use that mostly. To add to what Holly said, it also doesn't work very well on flocked paper. I have a Xyron X I use for smaller things and I use Glossy Accents for tiny things or clear things. I highly recommend the ATG! The refills last a really long time and it's so huge you can always find it on your table! LOL
I have 2 ATG guns. One is for photos and the other is general purpose (got one in clearance section for $9 didn't have tape in it). I use the ATG for most things, photos, ribbon, paper,etc.
I also use Scotch Quick Dry for chipboard, buttons(sometimes), bling,googly eyes, etc. Sometimes I use gluedots for buttons. I have a xyron X that I will use for little pieces, border strips. I also use the zig 2 way for small, intricate pieces. I have an arsenal of adhesives at my finger tips because I could never decide what I liked or should use for what. As I have become more experienced with workind with different materials I have stopped purchasing some adhesives like smaller tape runners and double sided tape, tacky glue. Unfortunately I did stock up on all these items and will have them for quite a while...
Learn from my mistakes and buy an ATG. you won't regret it!
ATGs aren't available here otherwise I'd get one. There is one similar product available, but I don't like the waste - you seem to be throwing so much plastic away with every refill. When a greener one comes along, I'll have my eyes open.