It should be noted that even though the post links to the perl version for some reason, it is actually not what cargo flamegraph [0] uses, it uses a reimplementation of it in Rust called inferno [1].
But even so, pprof's is better. (You'll have to try it or take my word for it; they don't seem to have a demo anywhere unfortunately.)
When you hover a function it highlights all the other calls to that function (in different stacks), and if you click it it shows all the calls to and from that function in all stacks with two-sided flame graph.
[0]: https://github.com/flamegraph-rs/flamegraph
[1]: https://github.com/jonhoo/inferno