I used ProTool professionally from when it was called ProMix and ProEdit and all the way through version four of the current ProTools I upgraded every time. And upgrading meant upgrading all your equipment and such. But something happened around then - processors got faster and programs like Logic were requiring no constant updates of hardware with very powerful results. So I finally switched as my main focus moved to directing mostly anyway it wasn't worth it keeping up with the sound gear and I could do all the same work, plus I'd have a more powerful sequencer.
When logic completely redid it's interface I was one of the super happy ones as suddenly all the really difficult stuff became simple.
Now - there are a few things I miss from protools. SPOT MODE is the main one. Having it so you drop in your sound instantly hit time code in your keypad and it lands. That was great. But you know what I don't miss? Upgrading my darn hardware so often! Somewhere I still have a sixteen bit 888 I think that I could never sell despite the money I paid wen first purchased.
So, for me, logic does great. If I wanted to be compatible with the audio world totally and fluidly and wanted that extra edge for the sound editing placement, ProTools is the way to go. It's a great app, I was an expert and loved it years and years ago, but my patience just ran out with it's hardware reliance and expense.
After writing this I realized I completely didn't address whether Logic uses RED files or not.... I've never tried. I got lost in the whole ProTools eval, sorry.