I wouldn't ever claim they are the best but I've been running a couple deepwater aquatics BLDC pumps and have been happy with them. One is on a freshwater system running 2+ years and one on my reef for 1+ years. The only issue I have with them is power flickers can confuse the controller and cause them to fail to restart so not a comfortable situation to go on vacation with. But a skimmer delay outlet fixed that problem.
On my nano I've been running sicce silents for a couple years without issue.
New tank has two rio pumps but haven't been in service long enough for me to have an idea if they are any good.
I will say that I will always do dual returns in the future as any brand can fail and awesome customer service is useless if you are a thousand miles away.
As an aside none of the aforementioned pumps have needed any sort of maintenance to date.
On my nano I've been running sicce silents for a couple years without issue.
New tank has two rio pumps but haven't been in service long enough for me to have an idea if they are any good.
I will say that I will always do dual returns in the future as any brand can fail and awesome customer service is useless if you are a thousand miles away.
As an aside none of the aforementioned pumps have needed any sort of maintenance to date.