You say that like web rendering engines grow on trees...

At this point your (multi-platform) options are:

  - Chrome + its kin 
  - Firefox + its kin

There is one/two new "third" browsers/engines in the works that will be ready "who knows when".

The shift you'd make is from Firefox to something based on Firefox / Chrome... then you wait and hope that Ladybird actually gets somewhere or that the Servo engine doesn't take another forever to mature... and someone builds a browser around it. I'd call that mighty slim pickings. Especially considering how beholden the downstream browsers are to the upstream ones, particularly for smaller projects.

No it's an argument against the comment "It works better in Firefox anyway"