Couldn’t find much about either from anyone actually running one. TF Tuned don’t do the Novy one but they recommended the charger over the Fast option when I spoke to them.
Maybe it depends if you are a suspension fiddler or not. The YariUp has more adjustment than my rct3 charger 2 but I wasn’t convinced I’d make the most of thy at benefit. I believe it remains an emulsion damper so (at least in theory) it’s more likely to get unpredictable on really fast rough trails due to foaming of the damper fluids.
Fast make 2 different dampers, one (yari-up, rev-up) is an upgrade for the motion control and just screws in the top cap like the MC damper. The other (more expensive) is more like the charger and replaces the entire shaft.
I’m not convinced by the need for IFP’s and bladders, we survived for years with “emulsion” dampers, without knowing that they were apparently awful. And whenever one get’s reviewed, no one notices it (when was the last time someone reviewed a fork and said it lost damping by the bottom of the hill which is what IFP’s prevent).
Just got one of the 35’s, so it’ll be interesting to see how I get on with the basic damper as my last fork was a Lyric RC2 which was amazing. Figure that as it’s a hardtail this time that really any limitations will be easier to ride around and the back end is more limited anyway!