Every tech has their own tools for every job. Here are the must have tools for right about any repair
iFixit Screw drivers for iPhone and galaxy repairs.
For iPhone 4/4s/5/5c/5s
http://www.ifixit.com/Store/Tools/P2-Pentalobe-Screwdriver-iPhone-/IF145-096 http://www.ifixit.com/Store/Tools/Phillips-00-Screwdriver/IF145-006 http://www.ifixit.com/Store/Tools/Flathead-3-32-Inch-or-2-5-mm-Screwdriver/IF145-011
iScrews to keep all the screws in place
For iPhone 4s
For iPhone 5c
For iPhone 5s
G-Tool Unbend iPhone 5/5s and iPad bend corners for a perfect repair and perfect fit.
For iPhone 5/5s
For iPad 1-4
For iPad mini
I personally use all of this tools daily and some of them are a bit costly but well worth it.