Wr's are built well and built to last, but sacrifice a slight weight disadvantage because of it. Done over a 100 hours on my 2016 wr450 never missed a beat. The kayaba suspension is light years ahead of the WP stuff, I also have 15 fe350 which I enduro because of the lightness but had to spend a heap of cash to get the suspension to work, swings and roundabouts
The only neagtive for my wr450 with the reverse motor is the air box induction noise gets on your nerves abit, and the fuel tank is only 7 litres, on the 450 it's about 60 miles and the light is on
I have a WYZ250FX (google it).
Basically a WRF with extras, Yams equivalent of a KTM XC.
Can be trail ridden with no issues and raced at any level without any sacrifice.
Basically any of the WRFs are good, the reversed style has many advantages, all of which are nice but not essential.
My best WRF of the lot was the one that was nicked, alloy framed model that someone else had spent an absolute fortune on in every department, truly awesome.
If you want a ride on mine around our enduro loop, message me your number and I will text you, usually Wed night for a couple of hours, weather dependant. (If its wet, you will not stay upright on the downhills!)
My personal take on a green lane bike - XR200!! (TTR250 still the best)
But hey, we will probably not go there.