Varieties are great to search for and collect, but if you're not careful, they can start to go on forever, with the merest difference from norm, such as one extra border tooth, counted as a variety. For that reason, I limit myself to Freeman types, and the odd well known Gouby.
No disrespect to those who want to go the extra mile. Good luck to them. But just not for me at this precise moment in time.
With specific regard to Edward VII (and this is one penny run I've started but not finished), I'd go for all the Freemans and leave it at that. Although I appreciate there are many micro varieties (even in just one year, 1902) as we have seen from the old coin monthly articles that Richard very kindly e mailed to some of us recently.