The difference is that Hogan built not just 1 promotion, but 2. The entire WWF expansion in the 80s was carried by Hogan, without him there is no way of knowing how well WWF and the massive gamble that was Wrestlemania 1 would have worked.
Memphis and Jim Crockett Promotions could have overtaken WWF and the whole landscape would have looked far different. His match with Andre at WM3 is as iconic as it gets
Hogan was also involved in making WCW on par with WWF, he is the catalyst that led to nWo, Monday Night Wars, Goldberg etc.
Its not just that John Cena cannot possibly compete with that, its that nobody in the wrestling industry can compete with those accomplishments.
His biggest feuds were probably with Edge and Orton and his "greatest" moment was when he returned at that RR. Those pale in comparison to Hogan's. Look at these:
* Hogan escapes the camel clutch, beats Iron Sheik
* Hogan slams Andre at WM3
* Hogan vs Savage feud
* Hogan loses to Ultimate Warrior at WM
* Hogan at Bash at the Beach 96
* Hogan vs Sting SC97
* Hogan vs Goldberg
* Hogan vs Rock at WM18
Those are easily some of the most iconic and greatest moments in pro wrestling, not just Hogan's. You compare his match against Rock and Cena's, and its a totally different atmosphere.
The argument against, i suppose, is that Hogan was working with far better bookers, Vince in his prime, Eric in his prime. Whereas John Cena is working under Stephanie McMahon and a almost senile bored Vince.
In retrospect, the fact that Hogan was a bit of a douchebag and backstage "powarz" is what lead to many great moments for him. The nWo only worked because the people involved had so much clout that the feud and stable got very over and hot.
Perhaps Cena is too nice of a guy and allows todays inept writing team and Vince to book him in bad feuds that lead nowhere (see Nexus, vs Kane etc).
Alot of people forget that Hogan was not really the "perfect" superstar that Vince wanted, he was a balding middle aged guy with a fake tan with loads of charisma. John Cena is the picture perfect superstar as it gets in Vince McMahons head, he does everything his boss tells him, young (or was young initially), great body, big, handsome, full head of hair etc.
(Granted Cena has had far better matches than Hogan and is probably a much nicer guy and easier to work.)
Uhh, really? You have selective memory.
Your Hogan list:
* Hogan escapes the camel clutch, beats Iron Sheik
* Hogan slams Andre at WM3
* Hogan vs Savage feud
* Hogan loses to Ultimate Warrior at WM****meaningless, he took the spotlight at the end, Warrior wasn't a mainstay at the top for any period of time
* Hogan at Bash at the Beach 96
* Hogan vs Sting SC97******this BTW, is one of the worst moments in wrestling history. It single handedly KILLED the greatest angle ever. It'd be like you're about to finish masterbating and your mom walks in.
* Hogan vs Goldberg*****meaningless, it was on free TV
* Hogan vs Rock at WM18
Here is your Cena list:
His biggest feuds were probably with Edge and Orton and his "greatest" moment was when he returned at that RR.
You leave out his initial feud with Brock and taking that mantle when the next big thing took the next big flight out of WWE. Hogan was the guy they built the company on, Cena is the guy who helped keep the house up when everyone left.
Cena vs Rock is a million times better than Hogan vs Rock because it wasn't contrived, you felt like they really hated each other. Plus they fucked Hogan vs Rock by having Hollywood Hogan vs Rock, it wasn't the original character (why I was so against turning Cena).
Cena vs CM Punk is every bit as big of a deal as Hogan vs Goldberg. It was actually even better because Punk's overness will last and it was built right
Cena vs HBK for an hour
Cena vs Umaga in an incredibly underrated match
Cena vs Batista and breaking his neck
Of your Hogan list, 3 of them were actually him hurting the company. The first is just his first title win, could have went against anyone, not really that memorable. The Savage feud was awesome, Cena vs Punk is at least that good though.
You can't sell Cena short. No matter how much nostalgia and the IWC culture might try, Cena has had a career that matches up with anyone's.
You say Hogan built 2 companies, but he also destroyed one.
As for Hogan's heel turn, you can't forget that it wasn't with the WWF. It was WCW. MUCH different fanbase. That's the south, that's "rasslin" territory. That's Flair country. That's why Hogan's heel turn was so seamless.