This is particularly true for trading platforms because money is involved and market movements can create real financial losses.
Imagine two users looking at the same platform. One person may be an experienced trader who already understands market volatility, while the other may be completely new to financial markets. Their expectations and requirements will be very different.
A beginner may care most about simplicity and educational information. An experienced user might pay more attention to available markets, charts, execution tools, and account flexibility.
This is why there is no universal answer to whether a particular platform is "best." The more useful question is whether the service is appropriate for the individual user.