which touch technology for outdoor use with nano hog 4?

Hello guys,

I am planning to buy a nano Hog 4 with a 24" Elo touch monitor.

I saw the model 2440L and there are different versions depending on the touch technology:

IntelliTouch
iTouch
IntelliTouch Plus
iTouch Plus
Projected capacitive

What do you think the best technology for outdoor use with the nano hog 4?