I want to create an equation to make decision on the best product that i want to be the best for example:

I have this 4 products:
- product1: lives 1 months, quality 70%, people rating 50%
- product2: lives 2 months, quality 60%, people rating 60%
- product3: lives 3 months, quality 50%, people rating 60%
- product4: lives 10 months, quality 40%, people rating 40%

how can i make an equation so from this equation i can choose product3 as the best choose for customers?

i can't create a relation between these choose based on what in my view is the best