I find broad generalisations difficult to make based on solely on whether a system is tube based or ss based, as either can sound good or bad. I have one system each of ss and tube, although i did the mixing thing on and off for a few years. I am very happy with both systems in their own right. Based on sound quality alone, there is really no ss amp out there that can compete with the clarity, dynamic energy, 'holography' and all round musical engagement of my SET amps. However, tubes have a number of operating issues e.g. heat, noise (with old tubes), and a general lack of reliability. SS is much more reliable and fuss free, and cost of ownership (both initial and ongoing) is cheaper. Ultimately, for me SS is great for driving inefficient speakers and SET for driving efficient ones.