Unity will be a better setup if you’re OK waiting a 1.5 months for it. At 6p 30q 100 amps should be a nice conservative max battery amps, and the unity will deliver more power to your motors since it has better thermals. You’ll also get all the integrated features that make the electronics in your board easier to setup (app, integrated switch, integrated bluetooth etc.). Definitely reccomend the unity for people that want to save time/energy/risk wiring up a bunch of different components since it is a more integrated solution.
That said, 2 focboxes should get the job done if you want to be riding ASAP.