One's a 6" and one's an 8"?
Might help to know the application and the end game. What is the setup, what are trying to accomplish with the driver i.e. front sub sub, rear sub, limited location and size, amplification, budget etc. Start there and let the fun begin!
Deff not much of a comparison for which is better due to size differences. Though, as stated... It would be nice to know what the speaker is going to serve within the system.. vehicle, location,and power if any at all