That comes down to mostly quality of life question. Do you want to live where Envoy / PSA / ?? bases are or live where QX bases are? The compensation and benifits are approxmiatly the same at both places. YMMV. At the end of 2017 QX should have 13 E-175 and 52 Q-400. Alaska Air Group 2016 10 - K forecasts at the end of 2019 Alaska regional (QX, OO) to have a loss of 15 Q-400s and a gain of 20 E-175 jets. Projected fleet in 2019 37 Q-400 and 53 E-175. So, math in public...QX is projected to have 13 E-175s at the end of this year, OO Operated 15...that makes 28 E-175 for the AS regional fleet at the end of 2017. That makes 24 E-175s remaining, AS ordered 33 for QX, with options of 30 more in 2020. So, QX is on that trajactory for growth.
The rest is a crap shoot. Actually, probably better off in Vegas or Reno actually gambling than trying to figure out airline futures. More fun too and drinking is encouraged! The Qs are to AS as the MD-88s are to Delta. Alrealy paid for and making money. Lots of money on the routes they fly.
Flow is complcated thing. The only airline that has it is American. Majority have agreements for interviews. I'd plan on being at a regional at least 5 years, upgrading, doing some training or checking, and thinking ball park 5k total and 1k 121 PIC. Unless you're well connected, that's probably what you're in for. So, QOL at an airline for the next 5 years, maybe a career, maybe less. When the economey takes another dump and the majors slow or f-word, you'll need to be competitive. The industry has 180'd itsself since I got into it 10 years ago, when no one was hiring, and CFIs were getting to regionals with 3k of flight instructing.
If you have more speific questions on QX PM me. I'll answer when I can.