Agreed, flash looks better, but who will be seeing it?
As a drastic example, if you sell an e-book on how to repair your 486, or how to get more speed out of your 28.8 modem then guess what, your target audience won't have flash, so go HTML.
But, if you're marketing broadband tools/services to IT professionals than definitely go with flash.
You just don't want to leave anybody out that may buy your product otherwise, that's all.
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