which one would any of you prefer and why?

For big game hunting, neither.

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Good Shooting!

Your talking about "Apples and Oranges" here the two different weapons systems are so dissimilar.
The SIG is alloy frame, steel upper, decocking lever, mag release in a normal position,standard DA/SA type action. Meaning a long double action pull for the first round, then a single action pull there after. Standard rifled barrel capable of firing lead or jacketed rounds. VERY well made pistol, with several factory as well as after market accessories available. If you were to purchase a 229 in .40 you could convert to .357 SIG caliber with only a barrel change, nothing else required. SIG magazines are all steel, and very well made.

The GLOCK is a polymer framed lower with a steel upper, no safety or decocking lever, mag release in a normal area, slide release control is small. NOT a traditional DA/SA action, but its own "safe action", depress the trigger and it fires, same pull every time.Issued sights are plastic but steels available from the factory as well as dozens of aftermarket companies. GLOCK barrels are not recommended for lead loads by the factory, so all you can shoot under warranty are jacketed rounds. MANY aftermarket accy's available as probably half of law enforcement carries a Glock.
As with the SIG if purchased in forty a .357 SIG barrel is an easy conversion. barrel only required. Glock factory magazines are very well made and trouble free.

BOTH are well made, have long service lives and are carried by both LEO and Military units around the world. Neither has a magazine disconnect. So will fire with or without a magazine inserted.

I would STRONGLY suggest shooting an example of each, side by side. As they are two different variations on a single theme.

Many people don't care for the fact that the Glocks have no safety lever. Touch the Glocks trigger enough to depress the little lever and your ready to fire with a few pounds more pressure. The SIG has a longer/heavier double action pull for your first shot. Many find the DA/SA system easier to live with, a lot fewer accidental discharges, especially is the person carrying the Glock isn't much of a gun person. THE major thing with a GLOCK is .......do not put yoour finger INSIDE the trigger guard unless you intend to FIRE the pistol!!! Simple, but tough to train at times.

There are two tremendous forums one for each system: GlockTalk.com and SIGForums.com ALL you could ever want to know.

My suggestion is to fire each side by side, thats the best way to decide what feels best to you. I just went through testing weapons for my Agency and a side by side comparison is the ONLY way to decide.
We tested SIGS, Glocks, H&K USP, Beretta, S&W and the Walther 99. SIG was #1 and the USP was #2 by a small margin.

Frank N.