add complication to types .
Martin's more common mandolins are bent tops , similar to the bowl backs they made 100 years ago, but the top has more surface area, as the back moved closer with the flat back style .

And there are flat top flat backed , a classic design gibson made for the troops , hence Army-Navy name attached to those , pancake body almost round.

then there are the carved arch top and back types   that Gibson makes
and so many emulators replicate , those in FF hole and Oval.

generally focus of sound of FF hole mandolins is out there , projects
away,
the sound seems to be more widely disburse nearby with oval hole sorts

there is a lot of creative cross breeding , banjo-mandolins and the like , so I'll leave curiosity being stoked .

try a bunch to hear what they sound like
as said :
writing about music is like dancing to explain architecture..