A good striker will beat a good wrestler 9 out of 10 times.
Taz my friend and I say this respectfully as I do respect you but it is actually exactly the opposite. Common misconception outside the sport though.
The only way a good striker on average is beating a good wrestler is if that striker is a good wrestler too. Just to understand better, though its been proven many many times I will shed a little light on this not with an opinion but with actual facts.
The best fighters in the world currently listed by weight class.
Heavyweight:
Fabricio Werdum (current champ) BJJ/Grappler background
Cain Velasquez (previous champ) Wrestling Background
Light Heavyweight:
Jon Jones (Previous Champ) Wrestling background
Daniel Cormier (Current Champ) Wrestling background
Middleweight:
Chris Weidman (Current Champ) Wrestling background beat one of the greatest strikers UFC has ever seen to get belt.
Welterweight:
Robbie Lawler (Current Champ) Striker but most of his losses came to wrestlers, and he was a very good high school wrestler in Iowas as well.
Johny Hendricks (Previous Champ) Wrestling background
Georges St. Pierre (Previous Champ) Started off as mainly a striker but became a wrestler as it was far more effective and IMO became the most boring UFC Champion with his take down and lay on you game. The only people he stood up with were people who were more accomplished wrestlers that he knew he could out strike. But for a long time he had the highest percentage of successful take downs in the UFC.
LightweightL
Rafael dos Anjos (Current Champ) Wrestling/BJJ background but did not become champ until he started wrestling hard with a wrestling coache at Calvary Chapel Great guy I wrestled with him as well.
Featherweight:
Connor (Interm Champ) Striker
Jose Aldo (Current Real Champ) Striker
Bantamweight:
T.J. Dillashaw (Current Champ) Wrestling background
Flyweight:
Demetrious Johnson (Current Champ) Wrestling background
So what I am basically showing you is that wrestling is by far the most dominant style and that is why the heavy majority of champions both past and present come from wrestling backgrounds even if they only used their wrestling to strike such as Jon Jones and Chuck Lidell. Fighters like these are what people wrongly but commonly point to as strikers who beat wrestlers lol their actually wrestlers that out strike other wrestlers.
Now you definitely have to be well rounded though in todays game and just being good at only one thing will not keep you on top very long. Maybe in the future pure strikers will start to win in the UFC consistently but I highly doubt it. There will always be your exceptions like Connor, Aldo, and Anderson but on average most of your top athletes will continue to come from wrestling backgrounds and then just cross trained.