If you’re using a dsp then I’d go with the soundigital. If not you’ll want to use the diamond audio. The soundigital does not let set you set speaker frequencies which is why it needs a dsp while the diamond does. I personally just ordered a soundigital 600.1 and 250.2 for my front set up and I’ll be ordering my dsp soon.
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2012 FLTRX, 26" AS Bolt on kit, 26" Mad Wheel, Dirty Bird Top Shelf Rear, Yaffe Tank, B'Cool Front Fender, Fueling 574 Cams, Sikpies Exhaust, 12" Yaffe Bars, Alpine Head Unit, Hertz hpd4 amp, 4 Hertz Spl 6.5s, 2 Hertz st35s, 2 JL 8.8s, Voodoo Speaker Lids, Rear Air Ride