If it were my choice, I would opt for the stereo subs.
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I think, that two subs are inherently better, than a single one, for many reasons:
Bass is directional, despite a popular opinion, than it isn't
Two subs will give you smoother in-room frequency response
Two are easier to position, to alleviate room- related modal issues.
When I was about to add subs to my own system, I have done some research and spoke with quite a few experts, and that's what everyone of them said.
Hello Manolo - the Rel is a very good sub and if you intend to connect the pair via high level ( speaker) interface, I would choose these over the Rythmic. If, however, you intend to use the low level interface ( RCA) to the sub, the Rythmic is the better performer and you will be more than pleased. I have the F15 in my music only system and got an F12 for the home theater system afterwards, so you can likely tell, I have been very impressed with their performance. Enjoy!