That's a good question, but the answer might surprise you
Neither is better. Now, let me qualify that before some folks get into hammerin' on the keys....
Not to sound like a primadonna, but I'll only build a 10mm to a certain level, and that's all the way. The problems occur when folks try and cut a corner here or there. A Colt product will have welded up and refit frame and slide rails, the Caspian will be fit from oversize dimensions. The result will be the same. Barrel fits, components,tolerances,etc...all the same. The series 80 components are not really an issue. They have to be properly timed in whatever gun you build - a 10mm isn't any more problematic.
The bad news is, that frequently in the case of a Colt, you start with a used gun. Colt never came even remotely close to being able to set up a 10mm properly. Many guns show battering damage from recoil, and damage to the disconnector slot from hammer chatter. When you add these common "warts" to generally horrible lines, inconsistent QC, and rollmarks that are usually uneven, you can see why a really nice Delta is "special". It takes more work to get to the same place with a Colt, but it's worth the ride

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