Well I have CBG and credit to SQ, I also have a Krysflyer Amex. The better cards with better earn rates are the more expensive Citibank cards but they are very expensive and of course Amex can't be used everywhere.
Another very valid reason to hold a CBG for SQ points, given how much cheaper it is (was?) than Signature (let alone Select).
doesn't CBG slug you an extra fee to transfer to QFF?
Nope - no fee. Only downside is that you have to ring to transfer to QFF - but that's hardly the end of the world.