For the average user I think it's reasonable to argue that a good, representative browser benchmark is by far the most useful general-purpose benchmark. Power users do many interesting and unusual things with their computers, but for the vast majority of people how fast your browser does things is effectively how fast your computer is.
That said, the reason I personally like browser benchmarks is that it's the only way I'm aware of to benchmark an Apple Watch against desktop computers. Not that I need to compare those, but it's rather entertaining to figure out just how fast the thing on my wrist is relative to past high-performance desktops.
Once the battery charges, I'll have to see how my S9 comes in.