D'Agostino amps are some of the best equipment out there. Regardless of whether they are solid state or tube.
To say that tube amps are best is not correct. To say that solid state amps are best is not correct either.
A great tube amp is just that, same for a great solid state amp.
Basically a great amp for your speakers regardless of solid state or tube is the issue.
Just like the classic judgement in Paris in the 70s for wine. hide the equipment and play recordings. See if people really can tell if it is tube or solid state. and also judge if one is better than the other.
if it sounds great. that's it.
enjoy