To the OP;

Starting in less than two weeks FO will require 1000hrs as a SIC in 121 operations before being able to upgrade (I don't know your background). You will spend at a minimum two month in training, then you will be the bottom reserve guy. Lets say that on average you fly 75 hrs a month, it will take 14 months before you obtain the 1000 SIC. Realistically speaking while on reserve you will likely average 50 hrs a months thus pushing your shortest time to upgrade to the two year mark. Regionals change rapidly, the one that seems like it's good now might not be in the near future. The regionals will see consolidation as there aren't many SCOPE clauses that require separate certificates. From people at SKW I have heard great things, there is no secret that due to the lower cost contracts around in the industry SKW will have to make an adjustment, but they are likely to be abetter place to work than most if not all. Flying the BRO is only going to give you more experience and increased QOL while making the same as the RJ.

Compass has a young pilot group and they are about to have a significant amount of turnover. As long as that pilot group is not merged with TSA or GoJet they will continue to do well. If TSH decided to do some consolidation then you will see things deteriorate as the attitude of these regionals is very different.