PIC, or jet time?
 

If had the opportunity to upgrade into a turbo prop (Saab) or right seat in a regional jet (E-175) which would be the best choice long term...

PIC Turboprop is always better than FO jet

my two cents

The only value of SIC time is to move you toward a PIC position.

Saab..........

It's what I did. Left flying a Crj (sic) for a Saab left seat..... I ll let you know how it works when i get hired somewhere better one day :)

Hopefully sooner than later

You'll enjoy the Saab! Have fun!

Also agree with the Saab. Unless you have seriously quick upgrade potential in the E-175, I wouldn't leave. Build as much PIC as possible.
That said, are there other QOL issues at play here? I would do whatever makes you happiest right now, the rest will fall in place, don't chase a career that may never form.

Take the left seat
my 2 cents

So Captain SAAB time is better than A320 right seat and above? Nah don't think so.

If you're applying for jobs which require 1000 TPIC that you don't have, then yes the Saab time is better.