On the 1900 you have a much more diverse set of destinations (I think the Bro goes to 6 stations now and the Beech 35+)... DEN EAR RIW SHR and good ol DIK and ISN up in Nokdak. No offense to my Bro brothers at Lakes but I would not have as much fun flying to only a few spots. You do a lot of scenic flying in the Beech... Telluride takes the cake of course but really almost all the beech flying Rockies westward is pretty. And I enjoy looking out the window.

DEN CA on the Bro looks much more senior than the Beech.

With the Beech the FO is typically boarding/deboarding/briefing the pax; no F/A like on the Bro. I don't mind dealing with people, but it makes things that much more rushed as your head is out of the flying game for a few minutes on each turn.