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Keep it in the same profile... it's not much of a benefit TBH.
I run GrapheneOS, but still use Play Store and the biggest benefit is that it's all sandboxed from each other, and the deep surveillance just isn't working... there's virtually no real use experience difference, a few things don't work (such as Google Assistant and the AI stuff) but that's a positive for me.
The only other thing that I occasionally use is that some apps I disable network for. This isn't possible on the default Google Android OS, but it's great... i.e. I have a Sudoku game app, and game apps are awful for adverts and intrusiveness, but hah this one has no network connection granted to it and it works great.
I installed graphene os yesterday after seeing velocios recommendation. Very straightforward to do. I'm now wondering whether better to put play store and all associated apps in a separate user profile or just keep them in the main/ only profile. Hard to figure out what is gained lost by either? If anyone could advise I'd appreciate it.