Lets start by defining what your definition of QOL is.
Do you like being home on saturday/Sundays?
Do you like the idea of an outstation?
Do you like hotels or crew apartments?

Lots-o-variety

CVG and OAK usually have a quicker turnover (IE less desirable, but again, YMMV)

Seattle and SLC are a little more senior

PDX, PHX and DAL fall somewhere inbetween.

Some bases are all turbine, some mainly cheiftains, some lots-o-outstations.