Having worked for both TUI and Jet2, I would have to say Jet2 is now the “Charter” Airline of choice.
TUI, in my honest opinion, lost its premier No 1 position in the UK holiday market when it lost the Britannia brand and started a whirlwind journey of name changes, not only did TUI lose its identity, it lost a loyal following of passengers.
Jet2 has shot ahead in the rankings, I would say Jet2 offers much more than any other in terms of the whole package and have become the first choice for passengers looking for packages and flight only, even taking into account they are often more expensive.