I have a delta G10, and Zaan, and for me it's not even a question for build quality, Zaan all the way. My Delta had to be returned new out of the box because the lock would collapse under pressure (not impact), I also felt the lock bar was too weak making the detent almost non-existent, and the opening was rough. After almost 2 months, return shipping, AND "warranty" fee it returned the lockup was better, but the detent was still worthless, and the opening smoothness was better but still pretty rough.
I really liked the design/shape of the Socom so I bought their ridiculous $20 proprietary fastener tool, took it apart and fixed the lock bar tension which mostly fixed the detent issue, polished some surfaces and the smoothness was much better. I've also learned that I prefer proper tolerances and bushing for a smooth pivot compared to bearings but I like a controlled blade opening with hydraulic like resistance. Most bearing knives you have to loosen the pivot to the point that the blade swings completely free if you want it really smooth, which makes for much less control when opening around sheeple. I've also learned on multiple knives that G10/Carbon fiber handles without full length inserts have a lot more flex in them.