Depends.

Usage

Platforms are great because you can build on them. Example Ethereum, Neo

Business usage like Request network

or simple payment like zoin (zoi) or SpeedCash (SCS)

Scarcity

Bitcoin has only 20 million something coins, Speedcash only has 400000 something coins while others have billions

Joke

DogeCoin (DOGE) but some are willing to pay for it



in other cases the coins are more or less mere Venture Capital