Certified nursing assistant and nursing tech? What's the Difference?

What's the difference between the 2, and perhaps the best choice, in terms of job prospects, pay, quality of life (if the work is easier than the other occupation), etc.?? I'm currently a certified nursing assistant & wonder if it's worth it to add on a nursing tech certificate. I prefer to work in a hospital. Are nursing techs more likely to get hired at a hosptial than CNA's? I'd work while taking nursing classes.

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