Flooring - to glue or not?

[markis]

I know far too little about flooring. ;D
If you are going to have underfloor heating on a slab, should you glue or click the floor?
What is the difference? Does the result differ? What should you choose?

 

[PA]

For practical reasons, I suggest a click floor. If you don't notice a gap in a joint when you're there in the heat of the moment, you can probably fix it the next day if you feel like "breaking" up the floor. If you glue it, it's over. Then you just have to accept the situation or bite the very sour apple and redo EVERYTHING.

 

[markis]

Okay, so what is the advantage of gluing the floors? Is it another type of material that one might be looking for?
Does it hold better? Does it withstand water better ("no" seams?)