Can't say much about FR but have worked with EZY and many, many other carriers over a lot of years.
You will look far and wide to find a better carrier than this in terms of their safety culture.
They have robust and challenging systmes. They do look to improve on the 'standard'. Was it not EZY that commissioned outside experts to look at pilot fatigue? Did they not change their crew rostering against the findings? Did the CAA not acknowledge the work done as thorough and competent?
I've never been employed by EZY but have worked along side their people. They have a lot of very good individuals but like all large employers, they have a few of plonkers as well. Same for BA, KLM, AF, TUI, AA, CO etc that I've experienced.
Statistics say that, sooner or later, one of these carriers will suffer a mishap. Hopefully not for a long, long time. No Doubt when it does happen the press will crucify them due to being low cost. I often wonder when the legacy people and press will understand that loco does not mean cheap; just efficient use of resources.