Must agree with the majority. Sell the Glock and keep the Sig. The Glock will sell faster and you'll be left with a much better gun. Only exception would be if you have no other concealed carry gun. Then the opposite would seem to make more sense.
Much better? At being a school bus?
That said if I shot glocks horribly and did a lot better with the P229 that'd be enough to make me keep that instead.
-Mike