Implanted microchips remove collar dependence
A compatible implanted chip cannot be forgotten on a hook or lost in the yard. That makes it a clean identification method for indoor/outdoor cats that already have a supported chip.
The tradeoff is compatibility. Verify the chip number against the manufacturer’s checker rather than assuming every reader supports every implant.
RFID tags are flexible
Sure Petcare includes or supports RFID collar tags on several products for pets that are not microchipped. A tag can also provide a workaround when an implant is not compatible with the reader.
The downside is obvious: access fails if the collar or tag is missing. Breakaway collars are common for cats, so the system must tolerate occasional loss.
Multi-pet homes need memory capacity and rules
Check how many identities the door can store and whether it controls entry only or both entry and exit. Those policy differences matter more than whether the identifier is implanted or collar-mounted.
Best decision rule
Choose the identification method that is most reliably present on the pet, then compare the actual access rules the door supports. “Microchip” alone does not tell you whether the product can selectively control exit, curfew times or multiple pets.