If you cut alot of pipe, a chopsaw with a carbide blade(dry-cut) for steel is a quick way to go, works on plastic too. I have been cutting pipe and strut with the same blade for a year without resharpening) I can't believe no one has mentioned a pipe cutter. Easier than hack saw for ridgid. Works on EMT. All you need is enough space to turn it around the pipe. No extension cord or batteries! I actually saw a plumber cuting plastic with one a couple of days ago. A decent reamer on drill (cordless if you choose) and the job is done. With EMT you can use Klien hand reamer) For larger EMT pipe you can use a simple (machinist-plumbers)hand deburring tool that takes about 3 seconds regarless of diameter.
Everyone is trying to over engineeer the job! Let me know when you design the better mouse trap.