Well, except for golem other 4 had enough time to prove themselves. I haven't studied them but they're on the market for years already. Features, innovation and usage bring value and volume. They have neither.

Golem is very promising, assuming they make it work. If you need alot of computing power, instead of buying a superexpensive supercomputer, you can basically pay with golem tokens and use users combined computing power. Or something like that, as i recall. Which is extremely promising and innovating. Nothing like this currently exists.