Altcoins are faster because they are far less secure than bitcoin. Even the fastest altcoin Ethereum still takes 9 hours to be as secure as 6 bitcoin confirmations, and the other altcoins are comically slower, taking days to months to reach the same security bitcoin does in an hour.
I trade small amounts of bitcoin frequently and it is perfectly usable. If you desire instant confirmation, then think about starting to use Lightning.
Other than that, even if you use other alts which are faster than bitcoin, the question is - when you need to convert it to your local fiat, do you have exchanges readily available for your alt?
Most local exchanges only employ the conversion of btc to local fiat currency.
Like in my local area, only btc, eth or bch can be readily converted to fiat.
So if you choose a certain alt, what available options you can have to convert it to other currencies? And what exchanges are they being traded with?