100w class A or 200 w class AB ????

In the same line of amps I think it's pretty safe to say that the 200W is "more powerful." Sometimes the watt rating is so misleading as to not mean much.

The class just tells you how they are biased. Some folks think class A sounds better. Class A is almost always less powerful because current is running all the time. If a circuit has a chance to rest(cool down) during part of the cycle it can take more current during the time it is on-more power because two (or more) components take turns handling the signal instead of dealing with it all of the time. In AB the current is running more than half but not the entire cycle like in class A.

Class A will not give you more "power." Nor,imho, would an amp drive a particular speaker better just because it is in class A.

Some think it sounds better.

Sincerely
I remain,

I agree with part of what Clueless said. I disagree with the other part of what Clueless said. : ) Sean
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Sean, for the record, you are making a habit of crashing threads.

Tabu, hell if I know, but with my Pass X150 running into AB after only 15 watts, I never could tell the difference. With my Scinnies, the X600 does that after 150 watts, and I still can't tell the difference.