"How do they compare with regards to durrability, strength, accuracy and reliability?"
Durability? GLOCK.
Strength? GLOCK.
Accuracy? Sig for bech accuracy, Glock for practical accuracy.
Reliability? Both are very reliable, but Glocks are known to be a bit more reliable.
The Sig 229 is way cool, but I cannot buy one because I like the Glock better. I hate the high bore axis on the Sig, and you will notice a difference in muzzle flip because of this. The Sig also has that horrible DA trigger. I could not hit anything with the Sig, so it does not matter if it is supposed to be a little more accurate from a bench, the Glock is more combat accurate because of the consitent trigger and low muzzle flip. The Sig is a nice gun and fun at the range, but the Glock is a real combat handgun. JMHO.
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"On a long enough time line, the survival rate for everyone drops to zero"
- Jack, Fight Club