Stock for stock, I prefer the SIG platform. But there are quite a few differences between each gun. I'll compare a P226 vs. a G17, both fullsize pistols, both equally accurate and both equally dependable.
P226:
- Cleaner trigger
- Smoother action
- Smoother to shoot
- Ususally better ergonomics
- Friendly grip angle
Glock:
- Short slack and trigger reset
- Easy to modify
- Small quantity of parts, easy operation and maintenance
- Easy to detail strip
- Plentiful parts
- Known for reliability and durability.
Most people don't like the stock trigger, and the grip angle. I was the same. But the Glock trigger can be modified to a nice trigger with a different connector, a few spring swaps and a beveled plunger. The grip angle can be overcome with use. I don't even notice it anymore.
Because of the short slack, I've now come to shoot my G34 and G17 better than my P226. My Glock triggers are now noticeably lighter than my P226 trigger, thus also helping me with accuracy. It's obviously not fair that I'm comparing a modified Glock to a stock P226, but the difference is that I can work on a Glock pistol without needing to send it out to a gunsmith to clean up and lighten a trigger like I would a P226.
I love both the same, each has their own purpose. At the range for just plinking, I've come to appreciate the simplicity of the Glock platform. A few extra dollars put into it, and it goes a long way.