Go for the ceramic in a fairly large bore if your putting it on a shutter.
And this is impartial advice..... I use freaks on my E-blade, eclipse cocker and shocker............. but the novelty is fast wearing off.
The freak JR has all the downsides of the freak without the one upside (being able to match paint). On top of that it's made by SP, I say get the ceramic.