2 REL T-5 subwoofers vs. one Rythmik 12

In a relatively small room 12'x11'x9'ceil. I really believe in the advantages of stereo subwoofers, which with the REL's it would be an easy fit. However the Rythmik would go lower. I am familiar with the REL subs, and these are no slouchs. I have never heard a Rythmik in other hand. Two 8" diameter drivers would be equivalent to 90% of one 12"diameter woofer so the amount of air movement capacity is comparable.
Any comments would be welcome. Thanks.