I have a different set of criteria than you. First is design and I like the servo design, and the brand that uses that design is Rythmik. There may be others, not sure. Secondly, I like integration as either easy or hard. I think SVS has an app that I have heard some people like and state it works, I have not tried it. Rythmik and REL have multiple ways to adjust levels to allow the sub to match my stereo and high level/ low level connection options. Third and and not necessarily in order is - does the company have a good reputation as a whole and are they know for making subs for the application your looking for ie Home Theatre, Stereo, etc. Fourth, and this is a BIG one, how is the reputation for service and build quality. If the sub is designed well, sounds great, but the brand does not care much about fixing the sub down the road, and would rather you buy another from them... I don’t buy from that company. I have had good luck with Rythmik, but I may try either REL or another brand down the road, maybe even Vandersteen. I wouldn’t buy SVS.