I think stellar was founded one of the co-founders or employee of ripple, so there should be great vision behind stellar coin, it is even now in top 10, no need to talk about its success, this can make it much more popular.
That's correct. It was founded by Jed McCaleb and it is a Ripple fork initially (although now it has built out many more features). Not sure why anyone would consider it to be "less trustworthy", it's still a blockchain and decentralized, and unlike Ripple, anyone can run a Horizon node for Stellar so it absolutely does NOT depend on a few big name players. In any case, people sort of mistake Bitcoin as being decentralized because anyone can mine but the reality is that 90% of the hash power is controlled by a very limited number of miners, so in that regard, Bitcoin is just as centralized as Ripple, Stellar etc.
The one advantage of ERC-20 is that the Ethereum Virtual machine is Turing-complete. That is helpful to build complex smart contracts. However, most tokens really are not very complex as effectively they are representing ownership and are securities, so they need minimal code to run. I fully agree that ERC-20 will absolutely be around and is a great platform for making complex smart contracts that solve difficult problems. However, for asset backed tokens (which is the new big push in the crypto industry), it's just not fast enough and the tx fees are too high.
There's a reason why Tokensoft.io for example is also building many of their partner projects on Stellar.