Unless you are sponsored by a manufacturer, drive what you want!
You will find some benefit in keeping with the same manufacturer as they are likely to share common parts, such as wheels, shocks, suspension components etc.
Note that Kyosho run a hex type wheel fitting which I think is sized unique to them - I have an X6 and an FS2 and both are ace
It just means I have to have twice as many rear wheels as I would like!
HTH