I use TB1 for most applications, it's cheap and sticks well. I use TB2 for most outdoor applications. I use TB3 for outdoor applications needing a longer open time...and will continue until I run out of the bottle that was given to me :roll:
If you need a longer open time use a PRG, the difference in open time with the PVA glues are minimal.
So many folks use either TB2 or TB3 thinking they are superior glues (over the TB1). Unless you are doing an outdoor gluing application, TB1 will suit your needs and keep the glue costs down.
Dave