S&T Volatility Trading — Equity, FX, Rates

Am wrapping up my S&T SA stint at a BB in the next few weeks and have been working closely with the options/volatility trading desks across the floors. Equity options, FXO, and rates options. I want to be a vol trader, the question is whether I want to be equity vol, FX vol, or rates, and I need to make a decision and am struggling to find a key pull between one or the other — they all seem great and would be more than happy to secure a FT role on any of the three.

Would appreciate if anyone has advice on these three spaces in terms of long term prospects, growth opportunities, etc. There is the fundamental difference of macro vs micro, but I'm also trying to consider changes in market structure, volumes, and profitability down the road. Thanks as always, cheers.