Hi again!
Achievements: Once again your comparing a 20 year career to an 8 year career. It can't be done, and it's sad that you keep trying.
Merchandise: There is nobody here that could possibly produce a figure that compares the amount of paraphenalia sold when Bret Hart was champion and John Cena's days in the WWE. Once again, Cena still has years left in his career, and Bret Harts is finished, you can't compare the overall impact they have made on the sport in any way.
If you really want to play that game, Mic Skills and Charisma are pretty much the same thing, so you can lump those into one score for Cena. And Wrestling Ability ties in directly with the amount of moves you have as well, so you can lump sum those two into Harts court for one point.
So no matter which way you spin it, when you actually have categories that matter when comparing a wrestler between then and now, Cena = 1 Point. Bret Hart = 1 Point.
And then we talk about the final category you presented, Fanbase. It would be truly hard to be able to differentiate this category because even though the buyrates say John Cena is more popular than Bret Hart, their times, once again, are decades apart.
There were alot less people around in this earth 10-15 years ago, compared to now. And Brets reigns prior to the Attitude Era, where he made the most impact, had substantially less fans watching wrestling than their are now. Both men were not in the main spotlight during the Attitude Era, where Wrestling was at its peak, so unless somebody has some sort of magical power to produce the quarterly ratings for that RAW where Vince McMahon faked his death, and we can see what the ratings were for Bret Harts segment when he talked about Vince McMahon, and then how many fans were watching a John Cena segment, we can't see who tuned in more to watch either wrestler.
That's the only way you're going to get a specific modern day statistic on who has a bigger fanbase. The rest is just assumptions. So until we see more of John Cena's career, or Bret Hart returns as a managerial roll for the WWE, then we may never be able to see who truly is or was the better wrestler.