2 inches
It isn't how big it is, its all about about how often you get to wash!
Having owned and used both sizes of Maytag, it was my experience the bigger tub would accept noticably more jeans, towels, clothes and achieve maximum rollover.
I almost never had the large tub go out of balance, but the small tub did so more often.
I had a Highlander that NEVER finished a load, no matter what size, without flipping out in at least one of the spin cycles. I had it rebuilt and asked them to replace or tighten the springs, but was told, after the rebuild, there was nothing they could do. I grew to hate the little bugger. Thankfully it was a just a toy and I have the 608 as a daily driver.
Kelly