There should be a dedicated sticky for all the pros and cons of Glocks, SIGs, HKs, Walthers, S&Ws and Berettas.
OP,
There is no one answer to your question.
They are both very good and respected guns that will do what you want of them, in whatever style of shooting you choose.
It'll be almost 50/50 between Glock and SIG.
Some will say " Get both!" Others will say handle them before you buy. Some will argue metal vs. polymer frame. Some will talk about the high bore axis of the SIG. Others will complain about the Glock trigger pull and the bad plastic sights. And others will suggest something completely different like a 1911 or a PPQ or a revolver.
In the end, the call is yours and what your wallet can fork out.