Neither, the Apex seal is still a problem on the Renesis. I found Rx-8s with new engines remember? They've improved it even more since 2004 but it's not getting any high marks for used models even with the 100k warranty Mazda slapped on all the Rx-8s. I should have been more clear and said the design is good but the implementation is poor. RX-8s are low mileage vehicles and failure rates are noticeably higher.
With the Miata they always have the option of committing more towards Rotary development. Although the size may actually be the reason they've got a smaller 4 banger in use. It's always an option if they up size the engine any more, 2.3l is about on par with the Renesis.
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~Allch Chcar
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