Is solar power better or is it hydro power?

Location, Location, Location.

If you're on a major river, Hydro is great (as long as it doesn't interfere with the environment too much).

On the other hand, Solar is avail anywhere the sun shines.

Edit:

Hydro is preferable, it is much more efficient, however Solar is more versatile, so yeah, it is very dependent on Location. Hydropower can work throughout the day and night, and can get you much more energy. Solar on the other hand needs to store power in various ways during the day to provide 24 hour service.