this is a tricky one
when Raven first joined I don't think he was that good a bassist tbh (listen to his playing on Ha !)
but as time went on I think he became a better "live" bassist than Youth, and seemed to have a clearer sound on stage
Youth doesn't seem to play live as well as he used to, and doesn't sound as good on stage as Raven
But at the end of the day, Raven isn't here any more so I would have to vote for him over the current version of Youth.