Overall I really like what Fender has recently done with their bass amps.
Their Bassman 250/210 sounds great, only drawback, it can't run an external cabinet. Two 10's maybe all you'll ever need but, it'd be nice to have the option to run more speakers with the internal ones if the gig required more coverage.
What you have, (2-10's), is what you've got.
I'm not sure if the G.K. MB combos are capable of running a external or not.
G.K. has had some problems with the MB series of heads in the past but I believe they got it solved.
Of the two you listed, I'd lean towards the G.K.
I've been using a G.K. 800 head for over 25 years, not a single problem from it!