Interesting question! The only experience I have of the Kazungula land crossing into Zimbabwe (and back) was during December. It was relatively busy (23rd) but we exited the Zimbabwean side after an hour. Crossing back late that afternoon took a total of 20 minutes!
At Victoria Falls we met a Zambian lady and her family who travel this route from Livingstone to Kasane to visit and shop. According to them it's much quicker than the ferry.
The land route involves two border crossings, but the ferry crossing involves not only normal border crossing formalities but also dis/embarking vehicles. Therefore, in your shoes, on a busy day I'd take the land route? ;-)
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