For what it's worth, after working over ten years as an industrial electrician, I prefer screw connections for ease of installation.
When standing on a scissors lift, twenty feet off the deck and leaning over to make a connectiion, it would take three hands to tighten a compression fitting, two for the wrenches and one to hold the pipe tight. With a set screw, one hand could hold the pipe together and one to tighten the setscrew. Much easier and no need for a helper (or a third arm). My connections never failed. My method for any setscrew: tighten, loosen a bit, retighten. Never fails. Ken Carroll
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