I currently fly both the C42 and Eurostar out of Popham. Both very good planes. The C42 is in some ways more refined, e.g. electric trim, a handbrake (the Eurostar doesn't have one!).
The Eurostar has it's flaws, the lack of a parking brake, the trim is a little 'blunt' and not well positioned but you forgive it all of that as it is the better of the 2 to fly. Lighter in aileron and feels more sporty. Probably slightly more challenging to fly than the C42, it can float down the runway. The perspex canopy is great for vis but it can get a tad warm in there on a hot day.