It’s hard to answer a question as broadly drawn as “which is the best?” Most products are good at some things, not so good at others. Before I recommend a tool - ANY tool - to someone, I want to know what that person needs to tool to be able to do.
Does it need to be easy to use?
Does it need to be highly configurable?
Does it need to be cheap? - that can be VERY important!!
etc, etc, etc
The only recommendation I’d make is this - figure out what you need in a CAPA package and then ask for recommendations based on your requirements. What works for me may not work for you.