Are you collecting or mowing? The SB45 appears to be a superior mower, and parts are available for it. You could easily fit a different engine (it conforms to standard dimensions, so many Kirby, Briggs, and Honda engines are a bolt-on fit, and you should be able to get a Briggs 80202 which was fitted as original equipment). In terms of collectability, the Villiers-SB is older and I think rarer, but I personally wouldn't consider mowing with a machine that has its chain exposed to dirt and grass like that.
