Welcome to the forums Jenn!
Now, let's see:
1 - I've never heard fo Searchdex
2 - Sitemaps is not an "optimization tool" - it's a place to list changes to your site's pages (additions/removals) and have them easily found by Google.
3 - Google likes it's own Sitemaps system - why pay for something external to this? Use of either will not result in better rankings...
Enjoy your path of learning as The Intern. We have a couple of interns here, though I rarely take enough time to harass them properly...
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