I don't fly for any of the airlines you mentioned, nor am I a pilot, to start with. However, I do have a fairly good view on layovers. Good enough to say it's probably not very wise to base your career choice on the sole element of how long layovers may be.
Few businesses change as much as the aviation industry. There used to be layovers going up to a week (and over). With the growing competition, most of that belongs to the past (especially for scheduled flights).
In a nutshell, if you're going to pursue a career in aviation, you better have interests other than the layovers. IMHO, that is.
Best regards and good luck,