I worked over ten years at an orange LCC based in U.K. and mainland Europe.
The full time rosters gave me health issues. I found it a great deal more tiring to work that schedule than I did working at EK.
Long haul and short haul both have their issues and they require different rest strategies. I never figured out an effective short haul rest strategy aside from going part time, which I couldn’t afford to do.
Whatever works on an individual level is what you should do.
For me, the flying was also a great deal more rewarding. To take an aircraft sixteen hours, over the North Pole, and then descend over the Bay Area to land in San Francisco I found to be infinitely more rewarding than taking passengers from Gatwick to Alicante several times a week.
Horses, courses, and all that.