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These services both relate to SEO, but they are not the same thing.
Wordtracker is a tool that allows you to do keyword research for your site. Wpromote is a search engine marketing firm who will optimize your site for search engines for you.
My advice would be to compare their features and see which one gives you what you need for your site. If you want to know what they can do for you which you can't do for yourself, I would suggest contacting them and asking.