Spectracide vs. Ortho | What's the Difference?

Spectracide vs. Ortho | What's the Difference? What's the best weed killer for lawns in your opinion? I know there are stronger herbicides out there, but these are some of the most commonly used and available in big box stores and on Amazon, as well as reasonably priced and economical. The concentrates always seem to go quite far and offer the best value.