The table in post #1 really needs a column for FFT
Some Fnirsis (DPOX180H, 1013D) and some Zeeweiis (DSO3D12, DSO2512G, DSO1511G) can display an FFT graph, but nothing more.
No dedicated window, no scale, no specific cursor, no specific settings. All of them, as far as I know.
This may not be completely useless, but even the cheapest benchtop oscilloscope can do much more.
Attached are pictures of the Zeeweii DSO2512G and the Hantek DSO2C10 (benchtop, for comparison).