SOJ is able to roll up to +10 Max discipline, which via the UE 6P bonus would be an increase of 1000% Multishot damage + ~30% elite damage that F/R can't roll. My question is does the damage calculation still fall in favor of F/R? I'm not sure when it's 100% is calculated.
So I was playing around with D3planner and it's simulate feature shows F/R ahead by almost double, so I have to assume that 100% is applied near the end of the calculation. So if I'm at 85 Discipline and MS did say 1 damage I'm guessing it goes something like 1 x 8500% = 8500 Damage. Adding 10 discipline would take that to 95 or 1 x 9500% = 9500 damage. The 100% from F/R must come after that first calc and be 1 x 8500% x 100% = 17,000 Damage. That's my guess anyway.
SoJ isnt that far behinde, it can actully be better that f/r if you got good SoJ + endless walk set and no good hellfire amulet. At least in higher Grift where u spend more time stationery, remeber endless walk give 100% multiplicative dmg so its only 25% behinde f/r and compass rose do have 1 extra stat. Problem is that its much easier to get a good hellfire and f/r than perfect endless walk set and SoJ.