Mushroom is #1 in my books
I have the HN version (not the OFNA version) the biggest difference being the Centax clutch. There is a full list earlier on in this thread..
In the Standard version, the OFNA come with lexan shocks where the HN version come with threaded alloy ones like the PRO has
BTW - If ordering from muchroom stock up on parts and any hop-ups you want while your at it. Very cheap