Coronado Solarmax 40 vs 60

I'm looking for some comments from Coronado Maxscope users. Which
would you prefer - a double-stacked 40mm or a single 60mm? Obviously
the image of the Sun in the 40mm will be dimmer but more detailed. But
would it be too dim for public viewing?

The double stacked 40mm is actually $600 cheaper than a 60mm and half
the cost of the double stacked 60mm. Would appreciate any comments on
this, thanks.