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UA can carry 150kg (on top of the weight of the rider and the bike) and are I imagine narrower / easier to maneuver.
Has been said already but weight to volume varies massively. You could easily fill up its storage box with large / awkward but light parcels way before you hit 120kg. a good reason to go for flat / open cargo loading areas maybe?
Think 2 wheelers are the best choice by miles. Do prefer DHLs cargo recumbent efforts to this DPD scooter thing
I've no idea what 120kg would look like in terms of volume. Would it be reasonable to assume that 120kg of e.g. Amazon deliveries in one of these could replace a small van (e.g. VW Caddy)?