I was down between the same two choices as you. My internal debate was:
- Buy the #2 with the cart.
- Buy the #3 as a standalone product.
Eventually, I settled on the #3 for several reasons. First and foremost, the depth of the #3 permits me to smoke whole racks of ribs without halving the racks or resorting to rib hooks. I also like the extra total volume for large cookouts and charity events (golf tournaments and whatnot) I might help cater. Third, to me the extra height of the #3, higher wattage, and extra shelving were simply too useful to ignore.
I think you'll be thrilled with either choice, honestly. I may still order the cart for the #3 but it is easy to use and easy to clean even resting on casters. The relatively small amount of wood needed for a good smoke in these models is astounding, and the impact on my electric bill (running at least one smoke per weekend since I purchased it) has been negligible.
If you have the space, have the need for the increased capacity, and the cost isn't a deal breaker I'd say go big or go home. You won't regret the #3 ...