I don't know how much playing time I have on my Studio or Rocoo by now, it's probably very equal. I have settled with the dynamic fw on the Studio and the latest Rocoo-P fw on the Rocoo-P. I do now think that the two units now sound much more similar than what I experienced a week or two ago.
I have also found the IEM that I prefer with both units, although all my other IEM's sounds great as well, but my RE262 really sounds much better than I have ever heard them before and this is actually second time around I have the RE262! Their 150 ohm impedance also works great with both the Studio/Rocoo, no hiss and the RE262 do need the driving power that both units happily can supply.