Take all of that into consideration, fast forward 200 years, and what do you get? A society evolved from initial scarcity of resoures, populated by biotech- and cybernetically enhanced vat-born people. Once you accept implants you are more open to cybernetically enhancing the brain, so they're in a perpetual network. They have probably abandoned family as a concept (for optimum efficiency, babies are created by randomizing chromosomes from a large set of "parents", possibly using a societal merit system to determine the chances of your genes making it into the next batch), and have a different society, culture, and creed to those of Earth.
Intentional Eugenics are not far off. Meanwhile, let's say Earth is run by a bunch of conservatives. Think Republican Party of Earth. Imagine Fox Earth Network News transmitting a shocking story about the newly discovered attrocity - those godless, unethical Martians have begun intentionally inducing strokes in their 2 year old children!
Then imagine Martians shrugging it off with "man, that Earth scum is retarded. Sure, the procedure has a 33% mortality rate, but the surviving children will be all the more intelligent (taking advantage of the fact brain tissue can regenerate profusely within the first 3 years. They wouldn't understand our OPTIMUM EFFICIENCY. They are, after all, the 99.9% of mankind that wasn't considered QUALITY enough to board a colony ship".
Shit. As soon as Mars becomes economically independent, wars with Earth would break out so fast it wouldn't even be funny. In fact, fast forward another 100 years and you have people fighting over colonization of Europa and Titan. Mars got there first, but Earth has more resources at their disposal.
Great. I now have a setting. I dub thee.... Technophobia.