I've often thought that a cedro ('Spanish cedar') top would be a natural choice with mahogany B&S.

The mahogany I've tested has had Young's modulus numbers along the grain that are pretty close to the denser spruces. A strong 'stripe' figure is a sign of lot of run out, and that reduces long-grain Young's modulus values. Since that's the primary thing that determines how thick the top needs to be, you end up making them about the same thickness or a bit more depending on the figure. However, mahogany is usually denser, so the top weighs more. This is going to favor bass over treble, and 'headroom' over 'responsiveness', and less power overall. Naturally, each piece is different.

I've often thought that a cedro ('Spanish cedar') top would be a natural choice with mahogany B&S. The look can be similar, but cedro tends to be lower in density, with decent long grain stiffness. It may be hard to find in sufficient width, though. I remember seeing three cedro planks at a yard about 25 years ago that were 2" thick, 10 feet long and 40 inches wide, but they were flat cut. Impressive.