All of my bikes are black/white oriented. That’s my personal preference. I just never really dug color on bikes all that much. The color graphics always look 80s/90s to me. With the exception of a clearance SHIFT Streetfighter jacket I got (all they had was black with hints of Kawi green), all of my gear is leather and either black or white (black/white jacket, black pants, white suit).
Visibility-wise white isn’t as great as you think. Statistically speaking (though we all know how misleading some statistics can be), white and silver cars are the most likely to be in accidents during daylight hours. I rationalize a bit thinking that solid white rider on solid black bike creates contrast, but I think I’m mostly kidding myself.
Dainese makes AWESOME gear (AWESOME!!!!!!). Get the jacket, hands down. The only downside to Dainese is their prices, so if you can get a deal there shouldn’t even be a question in your mind. Whether or not you get white or black should be solely up to your aesthetic preferences. I don’t think either one will really be super visible.