How Doubling Guitar Amp Power Output Affects Speaker Performance?

[g1]

What kind of usage do you plan for the amp? In certain scenarios, the lower power unit may even be preferable.

[K Teacher]

I need to decide between two little guitar amps. They are almost identical, except for the output circuit. One has a single 6V6, with about 4.5 watts output. The other, is also a single ended configuration with, two 6V6's wired in parallel and approximately 9.0 watts output.
Now, if I understood correctly, doubling the output power, only produces +3dB increase, which is barely perceived by the human hearing.
So, my question is:
With everything equal, and excluding the lack of perceived loudness, is there any advantage in using the
9.0 watts amp over the one with 4.5 watts output? Maybe better speaker cone motion control at low (82Hz) frequency?
For reference, I was planning to use the amps with either LEGEND-1028K or GA10-SC64