Argument from authority is a logical fallacy. It reveals potential confirmation bias, that is it is possible you simply looked up a paper which agrees with the opinion you already have rather than express what it is from the paper which allowed you to arrive at your current opinion.

Please reveal how you arrived at Proof of Work is better than Proof of Stake? Is there something measurable? A number you can cite? An equation?

The number I can cite to reveal whether or not they are equally secure in practice would be based on the actual attack statistics. I could ask what is the frequency and severity of successful attacks to Proof of Work and Proof of Stake (including DPOS) for a comparison of compromise rates or the rate of successful attack against the protocols.