I don't know about the LM, but the CS600 basically sounds like an excellent EL34 amp. That, it should be noted, is a very, very different sound from that of the Luxman 509, which sounds like an excellent Class A solid-state amp.
Your original question is kind of like asking, which is better, a Ferrari or a Rolls Royce? You are the only person who can answer that question for yourself. If you're not familiar with the sound of EL34 tubes and Class A solid-state amps, you really ought to try and find some to listen to before you make this kind of investment.
Your original question is kind of like asking, which is better, a Ferrari or a Rolls Royce? You are the only person who can answer that question for yourself. If you're not familiar with the sound of EL34 tubes and Class A solid-state amps, you really ought to try and find some to listen to before you make this kind of investment.