A lot depends on what you want from any system.
Analogue systems use one of two applications, either single coax which also carries the 12v camera power as well as the return signal to the DVR, or shotgun cable where the camera signal is sent down the coax but the 12v supply is sent down a separate cable attached to the coax cable, so just one cable in essence.
The DVR records constantly and the images are stored on the DVR until either overwritten or downloaded.
The IP system still uses a cable to supply the power to the camera, but sending the signal via a transmitter to a recorder, but if the signal is lost so is the image .
Very good systems are certainly not cheap and the most important part is the camera or cameras.
Swann systems are reasonable but do have a bit of a reputation of DVR recorder motherboard failure.
I had this system for a couple of years but suffered the motherboard failure and the cost to replace was unreasonable
Lorex is a better system but not a cheap system.
I have this system running now and has been for 5 years with no problems and , in my opinion, a superior system.
This system uses shotgun cabling and has been very reliable to date.