How Many Stamina Wheels Botw?

Spirit Orbs are rewarded to Link at the end of every Ancient Shrine. Link can obtain up to 10 Stamina Vessels, allowing him to have three full Stamina Wheels.

How many stamina wheels can you have?

You can upgrade stamina 10 times, each time you upgrade it you get 20% of a wheel. So you can have a maximum of 3 wheels.

Is it better to get hearts or stamina in Botw?

Stamina is better to have IMO. If you are decent you don't really need extra hearts and there is also food to increase your heart count temporarily. You do however need 13 hearts later on and you get 4 just by playing through the main quest. I personally found the game a lot more enjoyable with 3 circles of stamina.