Based on my understanding of your question, having 1 Tag and multiple extension would be a good option (my personal approach). Example: Today you have 5 variables for 5 differnt pages you end up creating 5 tags for each page, in case if your variable count increases each time you have to make changes accordingly for all those tags or if a new page is added you have to have addditional tag for thoses as well. if you have one Tag then it will be easy to manupulate the data with differnet type of extensions and the same data can be used in multiple areas as required. Hope this helps and please do let me know if you need more info.
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