I don't know about its slipperiness relative to Air Attack, but the Casco Speedairo is a much attractive design to me, i.e. among aero road helmets with integrated visors.

SPEEDairo - CASCOs superlative in terms of aerodynamics and cooling

I use a Dux Helm myself, and really like the retractable visor feature, but I doubt the Dux Helm satisfies those looking for aero features. It's a very good road helmet for all but the hottest days.