Jill I think it depends on what you are trying to find out.
If you want info that covers both your Father's Side and your Mother's Side you will want to do an Autosomal test. The downside is, it cannot tell you which side the specific data is coming from. Iff you do one, make sure it comes with the X chromosome test because that helps you eliminate some parts of your ancestry to allow you to target in on more specific people.
Being female the only other option is an MtDNA test and it only covers your mother, her mother, her mother on back so it is limited to the maternal side of each generation.
Hope that helps!
Also if you can download your results, you can then upload them into GedMatch and get access to a larger universe of people you might match and there are a number of different admixture views you can run.
As if you should stay with Ancestry or use another service, once again I think it depends on what you are trying to do. Here is a comparison of the various testing companies:
http://isogg.org/wiki/Autosomal_DNA_testing_comparison_chart
https://www.exploringlifesmysteries.com/23andme-vs-ancestry-vs-ftdna-vs-geno-2-0/
One note, Ancestry changed how they do their test and the current version is not compatible with FTDNA upload right now. FTDNA says they are working on it...