But looking at it from all the different angles, its hard to digest that it was actually better than Akram's delivery, if you compare the two as standalone deliveries, if you look at the situation, or if you look at what impact the delivery had, in all cases, Akram's delivery was much better.
Could easily argue the opposite were one so inclined, tbh.
As standalone deliveries: Both superb and virtually unplayable. But in the Pakistan team alone you had at least three guys (Wasim, Waqar and Aaqib) who could potentially have pulled something like that off, all three bowled plenty of unplayable deliveries in their time and at the time. Warne's delivery, at any time, no-one was doing anything like that on a regular basis. Historically, it's entirely arguable whether any of Benords, Chandra, etc. were even capable of bowling a ball like that at all let alone a couple of overs later again to get Smith. That's why it shocked the life out of guys who'd played at the top level.
Situation: Wasim's probably put the nail in the coffin of England's chances of winning the World Cup, Warne's was in the context of a Test so it's hard to compare. At the time, though, more people overall gave a **** about Tests, especially Ashes Tests, than Pakistan winning the World Cup. I would argue that the fan perception at the time was that winning the World Cup was great and all but Pakistan won because, after getting quite lucky with a wash-out in Adelaide, they got on a roll. Winning Tests was still the only game in town and their series win the following year in England did more to convince both Pakistan fans and others that they were legit, I reckon. Didn't last, though.....
Impact: Pakistan winning the World Cup had, in my view, no significant impact on their fortunes as either a ODI or Test outfit nor did it change others' perceptions of how good or bad a team they were/are nor did, I'd guess, anyone change their perception of what Wasim himself was capable of. Warne's delivery scared the piss out of a generation of English bats which contributed to over a decade of Ashes dominance. Even when he was bowling rubbish, against England, looked a millionaire.
The point is that it's all arguable. Like I said, I'm a Pakistan fan so you can bet I sure took notice of anything like Wasim, Waqar, etc. and whatever they did. But outside of Pakistan fans, I question whether Wasim's delivery impacted much at all. Sure you can argue that Warne's had media/hype support but any rating of 'ball of the century' is, by its nature, a measure of hyperbole as much as how much it turned/swung/swerved/dipped/etc. So a large component of rating it is going to be the amount of attention it got. Warne's, by far, wins on that count even if a lot of it is coincidence (access to TV's in Pakistan vs Australia at the time, blanket media coverage at the time and since, etc.)