I trust polkastarter more because I believe that's why Polkadot is more popular today, every single projects that use polkastarter are successful, Polkadot is the Worthy project that can challenge Ethereum, I used to use ICOdrops and ICObench but their platforms also introduce scam projects
ICObench and ICODrops only makes the list of upcoming projects available, they are not to be blame if any projects turned scam, moreover they don't guarantee any projects, they just make the list available for people looking for such details