RGB is all the rage atm. Im sure all the the brands will have versions only soon. It would be good to get the ones that use standard RGB connectors that daisy chain fan to fan. That way with the new MB's coming out you can control the color from the Motherboard. I think the Thermaltake is a custom setup.
Nothing like that is available for fans yet. Good colours, mhe not always but might happen. Software to control the RGB light for fans is nothing that exists. Also keep in mind that those RGB controllers for fans need to be placed inside the case so they're out of reach most of the time (unless you route the cable out somehow). Also cycle through colours and dial in the one you like with something analog is a bit of a pain the butt in my opinion. Regarding what fan to choose I think the Thermaltake ones are better looking, more descrete, will not make your PC looking like an 80s disco and they're not crazy expensive.