This depends on how you zoom and the situation.@Peadingle I didn't see anyone mention this yet (apologies if I missed it), but I briefly had the O12-40 and had insurmountable difficulty reconciling the opposite direction of zoom turn with my Panasonic zooms (14-140 & 100-300). This may not bother you, but I thought it worth mentioning.
All the best with your decision,
If you zoom with muscle memory, as I do for sports photography, then it is CRITICAL that all my sport zooms turn in the same direction. Things happen FAST. You do not have time to correct and turn the zoom ring in the other direction. Turn the zoom ring in the wrong direction, and you could lose the shot. Been there, done that, and lost the shots.
If it for this reason that I will not use a Sigma zoom on my Nikon.
For casual photography, the fact that I turn the zoom ring the wrong direction just costs me a little time.
Most of my zooms are Olympus, but I use the Panasonic-Lumix 12-60 as my travel/light GP lens. That it's zoom ring turns in the opposite direction than my Olympus does not bother me.