Hard to find any solid measurements of the Wharfedale speakers. The Arendal speakers are verified good speakers. The Arendal speakers will doubtlessly have a much greater dynamic range if you like to crank it every once in a while. The Arendals will have deeper bass extension. Unless I found any reliable measurements of the Evo4.2s, the Arendals would be my choice easily. The Arendals can safely handle any amount of power you throw at them- I had them hooked up to a 600wpc Parasound amp for a little while, and they absolutely rocked. Regarding the Wharfedale, some of these AMT tweeters can have a pretty ragged response, so their AMT isn't really a draw unless I knew for sure how it behaves.