Personally, if money is no object, I would go with Sinfoni.

In the case presented, I would do the Zapco.

From my experience the Zapco and the PG MS series are in the same ballpark.

The only real difference is the Zapco is regulated and the PG MS is unregulated.

When I used the PG MS series amps (MS2250, and 2x MS2125) the system would suck batteries (6) dry.

The regulated amps I replaced then with (4x Xtant 2200ix) did not suck batteries (3) dry.

Unregulated can be more dynamic than regulated.
However, in the case presented, 150 watts per channel with proper gain structure should provide great dynamics, regulated or not.