Brazilian Rosewood has a Janka hardness rating of 2790. For reference, Gaboon ebony is rated at 3080.
NOTE : The typical caveat , each piece of wood is different .
Hardness aside , as a Luthier I will always chose ebony as long as it is available ………..
It all comes down to what feels and plays the best to you and for that instrument
I know there could have been other differences in the density of other woods in the guitar that could have affected things, however, I was in the market for a Tele years ago. I wanted a deluxe Tele. The shop I used to buy all of my stuff from back then had the exact guitar I was looking for with both a rosewood and maple fretboards. I told the guy I was discussing the differences with that I didn't know if I would really hear a difference. He knew me fairly well and my playing level. He told me that I would absolutely hear the difference. He pulled both guitars off the wall and we went over to the amps. He picked an amp and dialed it up and plated the two guitars for me. I heard the difference right away. The maple had more snap and better response on the top end.I’ll wager in a blind hearing test, most of us couldn’t discern a significant difference.
For what it’s worth, one of my top 3 sounding PRS guitars has a full African Blackwood neck (neck + FB). I can’t describe tone meaningfully other than with perception based terms like woody, full ranged, slick. At its birth Paul Reed Smith proclaimed it a magic guitar. So I have nothing but good respect for the wood!
Especially when you throw in all the other variables like the amp, the rest of the guitar, and most importantly to me: how I start to play differently due to the feel of the wood under my fingertips. I swear I play differently, whether it is because of the level of friction from the various woods, or whether I can (barely) feel any grain like you might get with IRWs, or something else (quite possibly based on what my eyes expect).I’ll wager in a blind hearing test, most of us couldn’t discern a significant difference.