Maybe in the US it's simpler, but recently I had to do a chargeback on my Polish credit card and first of all I couldn't even initiate one until the transaction was fully processed(while it was only showing as "pending" on my account), so that took 3 days, then I could file a chargeback by making a complaint about a transaction, which I was then told would be "reviewed in no more than 2 weeks" and that is genuinely what happened - the transaction was reversed and the money returned but it took the full 2 weeks from the day I requested a chargeback.
Edit: also googling around none of those seem to have the solid buyer protection that PayPal has. With PayPal I can just open a dispute with a picture of the error (color is off or whatever) and within a relatively short time period the seller is forced to reimburse me the full purchase cost, including shipping. That's very valuable as a customer.