WiFi CAPsMAN vs CAPsMAN

I have a mikrotik RB4011iGS+ & I would like to setup my cAPGi-5HaxD2HaxD in capsman mode, so that I can have a WIFI SSID called main, which would be on 5500 for 5ghz, and 2417 for 2ghz. I would also like to setup a guest wifi SSID which would work across both 2ghz & 5ghz

I have been trying to use The Dude, but it always asks for the setup in CAPsMAN.

Can anyone let me know the difference wand which one would be better for my use case

So you have only one AP ? In that case there really is no need for CAPsMAN, just setup your AP without it.