Marshall Amps - Valve vs. Solid State comparison by The Clan's Craig McDonald

Which is better - valves or solid-state? Can youreally hear the difference? The Clan's Craig McDonald compares the sound of Marshall guitar amps - the classic JTM30 valve amp and the solid-state MG50DFX. Guitar - 1978 Fender Stratocaster - Seymour Duncan Hot Rails.