Go with the solid state Mac. The often subtle differences between tubes and SS is the liquidity of the tube sound which I think can be largely lost when you are listening to really loud music, as you seem inclined to do. Now if you maintain a SPL level around 80db and have heard and appreciate the difference between tubes and ss go for the sound you like best. Either of these amps should be able to drive your speakers with comfortable head room for peaks.
I agree with Tvad, watts is watts, BUT I do think that the sound of tubes often has a fullness in the lower frequencies (the 'power frequencies') that may cause one to think they are hearing something more powerful. Not fact, just opinion though.