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Neither will do anything for performance. Has used to have a Magnex on his 1.2 and it was pretty quiet until he had a custom decat and centre piece made up.
It's more down to which you like the look of if it's only the back box.
I had a Magnex on my 172 and never really had any complaints. They are a bit heavy though, and the mounts on the Clio aren't really up to much so getting it fitted properly took 2 trips to Demon Tweeks.