FLog2C isn't a big deal...
Link to My Film Emulation Luts for Flog2/Flog2C: https://ko-fi.com/s/850fbff392
Link to GafpaGear XH2s Conversion Lut: https://gafpagear.com/product/fujifil...
There's no right or wrong, do what gives you the best results.
This opinion is based on my own personal experience and knowledge. Although I appreciate Fuji's effort to develop a new Color Space, I have to say that Cameras are just data collector boxes, so you can change color coordinates however you want if theres enough data being captured.
A wider color space might get you more accurate colors, but 10bit still 10bit, theres no extra colors there. So i'd rather have Arri colors instead, but i can see myself using Flog2C in the future, if i have to. GafpaGear has the best conversion Lut so far if you choose the Arri Log route. There won't be a new one for FLOG2C 'cause that wouldn't yield a better result.