Having completed using all three of the bats that I have purchased, the difficult question comes in the comparison of the three.
The three are:
Mongoose MMi3 Series 1 weighing in at 2.12
Black Cat Joker Grade 3 weighing in at 2.14
Bulldog SpiriT20 Grade 1 weighing in at 2.12
Clearly I haven't touched on the Lekka T20, the Newbery TT and the host of other T20 short bladed bats that have appeared. I think that these three are good examples of the types that are available, some of which have minor modifications to the spec, but I don't think I'd see much difference between them and those I've used.
The pictures below give you an idea of how they compare with one another.
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I think the first thing I'd note about them is that they all encourage you to play slightly differently. With the MMi3, you know that you are going to have to attack, whilst the Joker gives you an option of defence, while the SpiriT20 allows you to play your normal game.
I think that with the SpiriT20, the thing that I found most impressive was the size of the middle. It was turning my badly timed rubbish into some pretty big shots.
For the Joker it was the ease of manoeuvre. Partially due to it being slightly narrower, I was able to wield it far more wristily than I normally do, which was a very pleasant experience.
With the MMi3, you have a club like block of wood that when you swing it transfers a huge amount of power to the ball, and if you need to score quickly, then it's not that hard, but if the bowler has an ounce of nouse, you'll be in trouble as it's not as easy to play the short stuff.
Having said that, using all three of these bats against short pitched bowling is relatively simple. Watch the ball, and get the wood on it. Play hooks/pulls/cuts. Don't even think about defending. Or rather, only think about defending with the SpiriT20. These are designed for attack.
The hardest balls to play turn out to be slightly back of a good length where they are just too short to go forward, and just too long to play back and hard. Then with the Joker and the MMi3, it comes down to your footwork. For all the power they have, you do have to move your feet more. If you do, it works well. If you don't, then you are stuffed! Well and truly.
Coming back to the question, can I choose? I'm not sure. I would happily go in at number 5 and bat for half an afternoon with the SpiriT20. It is easily good enough for that and you don't have to adjust anything. Equally, if I was playing T20, I could choose any of them. If I had some overs to spare, I'd probably take the Joker. If it was the last five and I was number 7 I'd take the MMi3 to try and score some quick runs.
My only other observation would be the opposition reaction. Taking the MMi3 is going to bring ridicule and apprehension in equal amounts. You will get sledged, but they'll also have an element of fear, thinking that you are going to hit it hard and a long way. The other two don't provide this type of impression and are slightly more subtle.
If i was to sum them up in a sentence each:
MMi3 is a bold statement of intent about what you are about to unleash.
Joker is a subtle bludgeon that will boost confidence and cause concern.
SpiriT20 is an understated weapon of mass destruction.
They all have their value and I'd suggest that using any of them you'd be likely to score a lot of runs or get out quickly. You'd have to select the one you felt most comfortable with.