Should I use smartcrawll instead of toast SEO?

I already use yoast for SEO and have optimized about 100 posts with it.
As I now have access to smartcrawl should I :
a) use it instead of yoast
b) use it in addition to yoast
c) just keep using yoast without using smartcrawl
Also, if I switch to smartcrawl, will I lose data (eg focus keywords) I entered using toast.
PS I'm not v technical which is why I'm confused about this.
Thanks for your help.
David.