When I first was given the option I didn't really understand I could increase my stamina so I was confused about what a stamina vessel was. But, I prioritized my health because I was a pathetic mess who could be downed in one hit. I continued to prioritize health, and I still do. I'm hoarding my remaining spirit orbs (I have 26 on me right now) until I max my health, which will happen when I finally complete my remaining two divine beasts. After that, I may decide to get a second stamina wheel.