(UK) Which of these mowers is better value?

Mountfield HP41 with STIGA engine Mountfield HP41 Petrol Lawnmower, Hand-propelled, 39cm cutting width, 123cc ST120 Autochoke petrol engine, Up to 250m², Includes 40L grass collector : Amazon.co.uk: Garden

Yard Force with Briggs and Stratton Engine Yard Force 40 cm Hand Push Petrol Lawnmower with 125cc Briggs and Stratton 300 Engine GMB40 : Amazon.co.uk: Garden

I'm starting a small lawn mowing business and am looking for a lightweight push mower (Has to be lightweight as I can only use a car at the moment, no truck or van) that will last me a year or so, at which point I would hopefully be able to upgrade to something better (Honda). Any advice would be really appreciated. Thanks!