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Ah fare enough the leasure motors are not for cargo bikes, hybrid with some panniers only tbf!
Talking about difference between the motors with a rated torque in the 65 to 85nm range.Rode a triobike with a brose cargo motor (85 or 90 as advertised?) and honestly my e8000 (70nm advertised) motor in the samr type of bike and drive train walked all over it in every situation (brose much quieter though), so sometimes the printed figures I don't think translate to a reality.
I’ve got a Butchers and Bicycles cargo which weighs 50kg and has the Bosch Performance CX motor (75nm torque). It gets up anything easily, even with two kids (40kg) on the front. We live by the South Downs.
My partner has just got an Orbea Katu with the Bosch Active motor (40nm torque). I thought the far lighter bike and load would mean it would ride the same, but the lower torque is noticeable, as we’d got used to the CX. It’s hills where you notice it most.
So with that in mind I’d personally go for the most powerful motor available for futureproofing on a cargo bike.