Shark is broadly right, but there's a bit more to it than that.
You need to look at the application you want to communicate with to decide which is the better medium. For example you can push quality services over ISDN as it can be point to point - that's a lot harder over ADSL.
May be worth addressing this from the other direction Dave - what are you trying to do?
Broadband is great for 'general' data access but it's pretty poor for timing critical applications or in fact for anything that requires guaranteed timely data delivery.
Conversely point to point ISDN2 is great for timing dependent services. Of course you get charged per 64k channel too - which can be painful. I.e. connect @ 64K that's one channel, and one call. Bond 2 x 64k to get 128k and that's 2 concurrent calls. Throw in the 16k extra channel (which to be fair few people support) and the costs can escalate rapidly.
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