I use both but I’m fairly new to Pi. For now things that I notably miss in Pi are plan mode and subtasks. I was also a bit surprised that it doesn't have default permission mode (deny all) like CC. It’d make sense when using an open router model. But I haven’t used extensions that much yet, so who knows what features I’m overlooking. I don’t see myself dropping CC for now though.

Isn't plan mode just a "make a plan first, don't change anything yet" addendum to your prompt? Haven't tried Pi, but given it's famous extensibility, that should not be too hard to build.

Personally, I recommend installing the rpiv suite, I like it a lot because it adds a lot of structure, better than plan mode on CC, IMO.

My base instructions for all harnesses say something like "when the user asks you to do something that seems like it would be complex, come up with a plan first."

Works.

If you really want a “plan mode” you can ask Pi to add it. This is the strength of Pi. It isn’t opinionated far past excellent execution.

Anything extra you can add yourself. You just ask whatever model you’re using to query the documentation included in the pi application and then its away.

I've found that OMP strikes a good balance