What color is this hypothetical Miata?
BW will work and is easy to use, but it's not gonna give a "show car" shine like Patriot...which is hard to beat for a garage queen. BW will last about a month for a DD. So if she's not driving through bad weather and or in really hot, sunny days (which increases the surface temp of the paint and can burn off wax within hours), you could probably get by longer between applications.
You could certainly also go the PS route which will give her months and months of protection. Then layer/maintain with HGG every few washes or so. You can also layer wax.
Whatever you use, pick up some BG and apply it for even more pop before she heads out on the road. It can be reapplied weekly without much issue at all.