We use comparative adjectives to compare two people or two objects. We use than before the second part of the sentence.
Good - better: Email is better than regular mail.
Bad - worse: Calling is worse than messaging.
Efficient - More efficient: Messaging is more efficient than email.
Fast - faster: Email is faster than sending telegrams.
Slow - slower: Regular email is slower than calling.
We use superlative adjectives to describe an object that is at the limit of a specific quality.
Upper: Some people believe Mac is the best hardware brand.
Lower: Some people think that messaging is the worst way of communication.
Fast - Fastest
Slow - Slowest
Good - Best
Bad - Worst
Efficient - Most/least efficient