Dkz:
Bulgarian Air: PPJN info from 3 years ago. Base salary marginally higher, no duty pay, pension etc mentioned.
Tarom: Basic year 1 captain salary is almost same as Wizz. Sector/duty pay looks less than Wizz.
Aerosvit: Bankrupt. Many staff unpaid.
LOT: Who knows! We haven't any meaningful data.
All I can say is this: there are many happy locals (and quite a few expats too) in Wizz. That may be because they consider their deal to be market leading, or perhaps just enough. You'd need to ask a lot of people their viewpoint though....
And I agree. Once it doesn't suit, move on. I did and so have others, but that doesn't mean it's all bad.