I strongly prefer the 35i over the 35d. Response from the 35i is immediate (part of that may be the new tranny). At low speeds, the 35d always felt a little laggy where the 35i does not. The 35i also feels lighter/more responsive overall. I'll withhold my final thoughts until the 35i is totally broken in. I drover the 35d for 11K and only have 1500 miles on the 35i.

I do not tow anything, so the extra torque from the 35d isn't as important to me.

That said, I recommend driving one of each.