The value of rewards can be deceptive, especially if you earn points or miles.
Here's an example: Card A has a welcome offer of 150,000 points, and Card B has a welcome offer of 75,000 points.
It may seem like Card A has a more valuable welcome offer, but its points are worth only 0.5 cents apiece. Meanwhile, Card B's points are worth 1 cent apiece. When you do the math, both card's welcome offers are worth the same.