Rocket, I've used both, but prefer the water-heated intake. I feel that, during certain situations, like idling in traffic and running at high speeds, the intake heat fluctuates too much. Sometimes, it's just too hot. But, with water-heat, the intake warmth is kept constant. The worst thing is, the heater hoses aren't as easy to make look good. I presently have a 181 Mercruiser engine in a Model A and am quite happy with water-heated intake. Hope this helps.
