That's a great question, but it's a difficult one for me to answer right now for several reasons.
For example, I have 10 Holostages scattered about (those little buggers are phenomenal), 1 Ground Box wired to the chassis screw of my Integrated & 1 Breaker Panel Box attached to the panel door. So, there's a lot going on.
The SR Active Ground Box is more versatile in that it can accommodate 20-30 ground wires. I forget the exact number. So, nearly everything that can be grounded is attached to it. That's a lot of expensive ground wires if you don't DIY.
In terms of performance, both ground boxes seem to lower the noise floor, enhance the bass, add body & clarity.
I believe SR & Heartsound Audio products are additive. For example, SR products seem to perform better the more SR products you have in your system. However, the HSA products may just interact with each other in a more audible way compared to the numerous SR devices I own.
That said, products from both companies seem to play well together. So, I believe your decision may come down to cost & scalability.
In fairness, I need to spend more time with the Holos, Ground Box Booster & Breaker Panel box before I can confidently render a final opinion. However, all early indications are the Heartsound products have made a more significant impact in terms of price/performance than the SR Active Ground Box.
But remember, I'm basing my opinion on the combined changes/ improvements to my system on the combination of several different Heartsound products working together versus one SR Active Ground Block, its power cord & ground wires.
One thing I can say with certainty is both companies offer a generous no questions asked trial period.