What kind of floor is it on? Often, they end up in the basement on a concrete slab. In that case, it shouldn't make any difference unless they were so close that the thing actually knocked against it. From my (limited sample) experience between top and front loaders, my new front loader vibrates MUCH less than the old top loader. It also weighs probably 5x more (the silly thing weighs over 200# where the old top loader probably wasn't much more than 35# or so, maybe 40#).
Is the WH plumbed with flexible or rigid pipes?