If the low cost life style suits you better then why not, but once you're there that's pretty much it as far as progression is concerned. The training department is the only step upward and it's not for everyone.
Lots of four sector days and early starts but mostly in your own bed at night, hard work and you will be tired but its a different kind of fatigue to long haul, back of the clock, multiple time zone changes.
Financially, a LCC will get you into the money seat sooner but the pay isn't usually as good as a legacy. An older applicant will do better in an LCC as by the time he upgrades at a legacy airline he hasn't got too many years in the Captains chair until retirement, a younger applicant will do better in a legacy as he will have more years on premium pay to make up for the longer upgrade time.
Horses for courses.