I wrote about why I recommend Furman with SMP instead of ZeroSurge or Brickwall today. All three have series mode protection. The patents on it expired a long time ago, by the way. Furman tests better, and has additional features like Linear Filtering (LiFT) and on some AR (voltage regulation) not to mention convenience features like switched outlets, etc.
If you already have a Brickwall or Zerosurge I'm sure they'll continue to deliver excellent protection for a very long time. If you are looking for new I'd suggest Furman with SMP to be better values.
See the blog post for Wirecutter’s actual surge testing. AFAIK, they are the ONLY source of third party surge testing. Every other review, opinion piece out there focuses on specs.