I have all sorts of T20 style bats including an MMI3, Bulldog, COR3, custom Red Ink and Warbird. Those bats that are an inch/half inch shorter blade make no difference whatsoever, the massively thick handle of the MMI3 posssibly suits some more than others, the fairly thin handle and lightweight nature of my bulldog make it very easy to use. If I play 'normal' sorts I don't find it makes a difference which bat I use.
Then again my bats weigh from 2lb 6oz to 3lb 2oz So I'm not one of those fussy people.