There has to be a healthy dose of both. Someone with poor wrestling skills can definitely be pushed to success if they have the right character and promo work. There are plenty of big names who only knew how to do a few moves really well. They have to have the respect of the locker room to do so though, because it will be everyone else’s job to make them look good and they still have to know the bare minimum not to hurt any of the other talent.
There’s only so far you can go without improving the wrestling though. Matches get too repetitive and it’s very easy to get cornered into Goldberg territory.
Personally, if I had to watch someone with incredible wrestling ability who can’t work the mic or someone with all the charisma in the world who only knows two moves… I’ll prefer to watch a great wrestling match with a manager boosting the out of the ring portions. For true success, you really need heavy doses of everything.
I’d have to go with X-Pac turning on Kane. I loved them together so much. Kane learning to speak to say “suck it” was so much fun. It felt like such a genuine friendship of outcasts… and the way it went down was so brutal. It was like watching X-Pac turn on an injured puppy.