There are only two major differences between the B17 and the Team Pro:
1. The Team Pro is about 10mm narrower.
2. The Team Pro does not have the ventilation holes.
Both are pretty darn close in weight, and some allege the Team Pro has thicker leather. Both are also available with Ti rails, if weight is your concern, but between the dropping value of the dollar and the increased cost of titanium, the cost of the ti-railed versions have gotten downright ridiculous.
I have B17s, Champion Specials and Team Pros. Personally, I like the B17 Champion Special the best...it looks nicer and fits me better than the Team Pro - even on my road bike, and to me, it ventilates and provides a little more 'give' on the taint due to the holes.
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"Let us hope our weapons are never needed --but do not forget what the common people knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny. If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws" - Edward Abbey