Not sure you will get a Dec to SXF just now. A fair amount of SFO's just in the upgrade process and returning, and a few didn't get to go straight back. This indicates the base is full (?). Regarding rosters, the SXF is among the best you will get south of MAN. Very sensible compared to further south, and as a benefit you have really nice crew all around.
I have been based on a fair few bases over the past 10 years, and outside of UK, I will choose SXF any day. - But this is just my opinion.