Readable web font weights for blogs

I have a dilemma. Which would be an ideal weight for long text or blog articles? Should it be light, roman or regular? Which is easier to read?

I currently using "Neuzeit Grotesk Regular" on my current website. Would "Neuzeit Grotesk Light" be more suitable?

Neuzeit Grotesk Regular Neuzeit Grotesk Regular

Neuzeit Grotesk Light Neuzeit Grotesk Light