Smoke and mirrors, IMHO.
Assuming extremely e. g. TAP, Hop!, BulgariaAir and Finnair treat their pilots the best. How would an example Austrian pilot join them?
Notwithstanding the observed fact that the most adaptable survive, i. e. the most unscrupulous. Same people who squeeze the hardest will be the ones putting most caviar on the toast and having the brightest
PR fireworks. And as long as promised base is close to home, people will line up for that.
Aviation is international, EASA licences are EU-wide, but personal pilots lives are still local for the majority.
The choice usually is the 1 local carrier, or 1 max 2 of the Cross-national LCC. Or change the domicile to wear the expat redshirt. Different options when divorced, true.