OA,
In the airline industry, very few people manage to stay put and not move/commute. If you are one of the few, great. Count your blessings.
Most people usually move to their first base at the beginning. New pilots on reserve and commuting don't fair well in the reliability department. You don't want a black mark on your career because you got fired while on probation due too many failed commutes.
If you are young, you need to seize the opportunities to get on with a good regional and get your turbine pic. Then, quickly move on. YOU decide which one fits you needs. If it is Horizon, then go there.
Realize that if your long term plan is Alaska Airlines, Horizon may not be the quickest route. Due to the staffing issues at Horizon, the AG is hesitant to poach from the Horizon pilot group. While Horizon pilots have interviewed and being selected based on the hiring quota, there is quite a stagnant pool of them waiting for class dates due to staffing problems at Horizon. (Source: AS CA I know well).
Go where your heart yearns. However, be careful to not let your heart cloud your judgement regarding career decisions.
I've been in this industry (with one airline) for as long as most millenials have been alive. Yes. That makes me sound old. I really don't feel old. But, looking back... I feel really lucky. I have a great job with great seniority. I really can't complaint.
From my perspective now ... Again, if you are young, go where you will get your time quickly and move on. Seniority is everything. If your first airline job is flying a jet, I'm jealous. It will make the next airplane that much easier to learn.
Flying a turboprop for 5 years (doing between 6 to 8 short legs per day in the weather all day) builds character. I know. Been there/done that. However, the jet is way more fun.
Sorry for the long post. Since this is an Internet forum, someone will call all this BS and say that I'm some poor CFI making stuff up. Hey, so be it.... I just hopes it helps some....