I will personally like to see SBD being properly pegged to 1 USD. There are multiple benefits to this.

I personally think that stablecoins are one of the ways to onboard masses to cryptocurrencies. In terms of risk, apart from DAI, the other stablecoins you listed all require trust on a centralized party. You have to believe that those coins are backed 1:1 with actual fiat.

DAI on the other hand is backed by ETH. It's total supply, monetary policy, and available collateral are all openly visible on the Ethereum blockchain. On top of that, there is decentralized insurance like Nexus Mutual that is able to protect you against technical issues such as smart contract bugs.

Hence, I personally prefer DAI over the other stablecoins.