You see it is not enough to say the shitcoin provides a utility, that utility has to be needed and be used. For example I could create a shittoken and claim that if you buy it, the token would cure cancer. But that doesn't mean it does provide that utility!
What you have to first realize is that "confirmation" is a measure of irreversibility of a money transferred not just an arbitrary number. With that clarified you can easily see that bitcoin has the fastest transactions because on average each bitcoin block takes 10 minutes to be found and 1 confirmation is providing a huge amount of security.
Compared with traditional payment systems, they usually become irreversible after months! That is already millions of times slower than bitcoin.
Compared with altcoins since they don't have nearly the same security as bitcoin, specially shitcoins that have mutable blockchains like ETH and BCH, they are never secure and best case scenario is to have thousands of confirmation that would take days and you may still not be nearly as safe as having 1 confirmation on your bitcoin transaction.