I have used
1. Kimber for CRF, bear gun, 375H&H
2. Pierce titanium for true ultralight 6.5 PRC
3. Christensen Arms, 300 wsm
4. Coming soon - teminus Kratos lite for a 300 WM.
5. Tikka 30-06. Definitely smoother than the CA.
6. Rem 700. Roooouuuugh. It was a newish one, felt like dragging sandpaper.
Have a feeling I will prefer the terminus above all others because of the bolt throw. The CA is just not that smooth to me and I hate the bolt handle. Tikka was nice, but did not care for OEM mags and bottom metal.
Kimber all the way if you want a CRF, the defiance option is crazy expensive to do the same thing.
Pierce is fantastic for as light as it is, but it's more of a specialty action in my opinion. I wouldn't build too much larger than a 6.5 on a titanium action. There is such a thing as "too light" in my opinion.
All depends on what is most important to you regarding ergonomics, bolt face availability, bolt throw, integral rail/recoil lug, etc. there are dozens of fantastic actions out there.
I would say buy from a company like Terminus or Pierce where they are proactive about customer service, involved on sites like this, and willing to shoot straight with you on lead times, etc. many companies/smiths over promise and then don't deliver when there is an abundance of customers.
@Joel Russo can help you out for sure.