I frequently fly this route. I jump between J & F. I feel if you do the math the best bang for your buck is J @ 90k miles.
ANA Economy 40k miles vs United 70k Miles vs $600-700 summer promo fares
ANA Business 90k miles vs United 160k Miles vs 6-7k
ANA First 160k Miles vs United 240k miles vs Unknown TA rate
ANA has an superior J product to it's competitors but honestly lacks an bit on F. Availability for F seems to be better for me since I like to book T-30.