Many "generic" flash manufacturers have units that are should compatible with the Canon RT radio system. Most of them contain "RT" in the model number of the units they offer as compatible. Most of them are largely compatible with Canon RT-OEM devices. It gets a bit chaotic when you try to match two different generic "RT" flashes from different manufacturers. Then problems seem to appear more often.
Yongnuo is probably the most well-known brand that makes generic RT flashes. Not all of her flashes use the RT protocol. In fact, most of her flashes don't. But those who have an "RT" in the model number, like the YN600EX-RT II. In the Yongnuo naming convention, EX means that the flash is TTL capable. The RT means that the Canon RT radio protocol is used. Most Yongnuo TTL flashes can also perform HSS, second curtain sync, multiple flash, etc.
If you only use flash units, RT is not a bad way. However, if you ever want to mix flashes with more powerful mono lights, either battery-powered portable or mains-powered studio lights, you can only trigger these flashes by connecting an RT receiver unit to the wired trigger connector to "fire" the mono light. To change the power supply or other settings, you must do so directly on the control panel of the flash. You are almost certainly limited to manual power control without HSS, E-TTL, second curtain synchronization, etc.
There is another wireless system that offers compatibility with luminaires in its product range, from manual compact flashes with low power consumption and a guide number of less than 40 meters to very powerful studio lights with an output of more than 1,000 watt seconds. This is Godox, which is also sold under various trade names. For example, Adorama in the USA sells Godox products under the "Flashpoint" label. There are also vendors in Europe that sell Godox products using a private label.
Using a TTL-enabled receiver with the Godox system enables remote control of the power supply, use of HSS, etc., as long as the flash is able to do the same directly on the camera's hot shoe.
This is something to think about before delving too deeply into a radio protocol for flash units.