Need advise regarding SEO and Catalist framework

Hello,

After 2 or 3 weeks of research and having tried about 50 free and premium buddypress compatible themes with no satisfactory results I think I will finally switch to catalyst framework.

I have been using my theme´s included SEO features (atahualpa) for the last 3 years and now I will have to manually do all the SEO work again for every single post and page. Catalyst includes SEO options but, as I don’t want this to happen to me again in the future, would it be advisable to use a third party SEO plugin (like all in one seo pack) instead of the included SEO?

Does the theme changing (after 3 years of using it) may have a negative impact regarding google rankings?

Thank you for your help,

Luciano