How do pokemon stats relate to attack power?

Solution 1:

Bulbapedia has the Pokemon damage formula. But the short answer is that it is multiplicative.

Which attack is better depends on your opponent's defenses, but lets assume they have 100 in both Defense and Special Defense. You didn't specify a level, so I'm going to assume 50. Results below with differences in bold.

For attack = (2*50 + 10)/250 * (110/100) * 80 + 2 = 40.72 * Modifier
For Special Attack = (2*50 + 10)/250 * (100/100) * 90 + 2 = 41.6 * Modifier

This shows your special move will be slightly stronger, which is expected for multiplicative factors (For any 2 numbers adding to the same sum, you will get the largest product when they have the least difference between them)

Note that pokemon has an element of randomness in the Modifier , and this can result in a 15% variance in practice.