Depends on what you are looking for but I’m having good results with Unifi branded cameras and storage.

It is technically possible to use the cameras without the branded recorder or the reverse with the Network Video Recorder saving video from other brands of cameras over RTSP.

However in practice it only really makes sense to do that if you already have some equipment. Long term they really are designed to work with their own stuff. Pretty price reasonable and work both wired or wi-fi depending on the particular models you get. Happy to share more details if anyone is interested.