Hmm, I think we're talking about different kinds of "number one".
The ancestor comment called Scala "niche" and criticized the characterization of it as "widely used". So given that context, I was coming at this from a perspective of popularity; Chisel is orders of magnitude nicher than even Scala itself and orders of magnitude less widely used. Most of industry is still choosing VHDL or Verilog for most greenfield hardware projects.
I think you mean in terms of "best way to do it". Chisel can at least lay claim to that crown, sure, though I think you could say the same about Scala too.
(I might say Clash for hardware and Haskell for software, not that that does me any good.)