its easier to find a nice unmolested example of a supra that you know will be reliable.
if the rx7 is a particularly tidy example i'd go for that, but it seems quite difficult to find one that hasnt been raped to within an inch of its life now.
the supras have crazy torque, are wicked long distance tourers, and are quite a comfortable place to be. they tend not to spit out driveline components or have engine faults. they are way less stressed than the rotary engine and make you a lazy driver.
they can actually hold their own quite happily through a twisty road too if you how to drive.
brain says supra
groin says RX7
oh and i dont know many people that have owned rx7's longterm , they seem to be owned briefly, enjoyed, broken, fed up with, fixed and sold onwards