The difference is that a TfL Rail (MTR Crossrail) Driver could join any number of Tocs as a "qualified Train Driver" whereas a LU Train Operator could not. I do not know what MTR Crossrail are paying but Lorol pay is one of the best in the industry, and the highest for the type of work that they do.
This will be quite a big factor to do with retention of staff, but there is also a smaller factor of there being a totally different culture.
LUL drivers do, however, have the option to move line. Since ATO came in on the Northern Line, there seems to have been a tidal wave of drivers moving to the Met Line - in some cases drivers who have been on the Northern for many years, and for whom moving to the Met Line was less convenient in relation to where they live. Meanwhile, other drivers have expressed horror at the thought the Northern Line could one day end up being an Edgware-Battersea service, with the Barnet-Morden service hived off.
You can always staff a boring operation with new drivers, and with a rump of senior drivers who don't care where they work as long as it's convenient for them domestically and the money comes in every 4 weeks. Unfortunately, the trade-off tends to be increased errors (from perennially having new staff on the books), and quite often increased sickness levels and, perhaps, militancy.
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Victoria Line tends to be rather boring to drive, and the Central Line does involve driving 92TS, and that's less than fun...
Generally the Central is quite well regarded by drivers. As well as the line being surprisingly laid-back in nature, the 92 stock is actually quite popular. One driver who transferred from the Northern to Central remarked to me 'it's brilliant over here, the trains are so unreliable half the time my train is cancelled'. I don't think it's quite like that, but coming off a line like the Northern where trains are very nearly NEVER cancelled due to no ok stock I can understand the novelty.
The Vic is boring, but I've always found Vic drivers surprisingly cheerful. There are advantages to it, you're never working in the same cab for more than 35 mins at a time, and are never too far from your home depot, so less risk of finishing late.
Personally I'd suggest the Jubilee is probably the worst to work on. Pretty boring (especially now it's ATO), and a bit of a ****ty relationship between drivers, management and service control, which manifests itself for example with drivers being chased over quite small delays, and more confrontational comms between drivers and managers / controllers relative to many other lines.
Picc and Circle/Hammersmith are generally regarded as being very militant, however staff working there will generally say that despite this things are still pretty civilised.
District Line is always known for being pretty relaxed.
Not much to say about the rest, the Met Northern and Bakerloo just seem to get on with it without any bother.