Zermatt Origin or Defiance Classic

I only have experience with zermatt. They are great actions. And they do have the best customer service in the game.

Think about the features you want, the big difference between these two actions is one is push feed and one is Control round feed.

Also take a look at the impact 707 action.
 
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I've had multiple zermatt and defiance actions. Currently own a tl3 and a rebranded deviant. I'll take the tl3 over the deviant any day. Same for the origin over the classic.

Swap bolt heads (for 150 instead of 350 to 400) and barrels whenever you want. CRF/ME action let's you run any case length you want (I love 6br).

Zermatt just plain works.

*full disclosure: I actually like ARC better than both but you didn't list them.