If you are only planning on using one sub at time things get much simpler. Any of the subs should be fine. Having an easy way to adjust crossover, level, phase, polarity and EQ is a big plus. If you do not have the ability to measure, like using REW, then you will have to do this by ear. That favors the SVS with its phone AP.?
?
There are many different ways to perform the integration. I can send some links if you’re interested.
Charlie Conger