Jet2 have a great reputation and fast growing passenger loyalty - They are doing very well out of STN in the South - I just wished they would start flights and holidays out of their ''spiritual home'' of Bournemouth and kick the incumbent to the kerb...
As for BA economy short haul leg room - We all know how shocking it has become and even worse on their new Neo fleet in some respects. The last row is appalling.
You may still be lucky and get an older config where the leg room is better down as far as the E/Exits (The movable Club Europe cabin that had 34'' pitch) but most of the fleet are having or had new slim seats fitted and pitch is much less throughout.
As for Club Europe - you get the luck of the empty middle seat, but unless you can grab row 1 (or the exit rows if there is a big Club load) for legroom and space then it is gruesome for the money.