I saw many upcoming projects are offering same kind of ERC 20 token which can get through any Ethereum wallet. It doesn't need any specific wallet. On the other hand hand some crypto companies have unique code and they have specific wallets for their tokens. I am a little confused which kind of token is better. ERC 20 or either the unique one ?
it is quite easy to differentiate. the difference is just the platforms.
ERC-20 Tokens are projects based on etherum blockchain network, that is they have their own contract address or better still smart contract which explains how they got they the tokens created.
There are also nem blockchain projects, stellar blockchain projects and also neo blockchain projects.