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The biggest, and probably insurmountable hurdle is the gravity on Mars which is about 1/3G. I don't think there is enough gravity to hold a dense oxygen/nitrogen rich atmosphere... or if one did have an atmosphere, there might be significant "leakage" into space which would mean that it would have to be continuously replenished which would be very bad.Perhaps one could build a Krypton/Xenon atmosphere which would give pressure, but not breathable gasses, but finding that much heavy inert gases would probably mean mining Jupiter.. which would mean a lot of transport between planets.
Venus is one big volcano, so new atmosphere is created faster than solar wind can blow it away.And for Titan, it's so much farther away from the sun that the solar wind is not a big factor over there. Certainly considering the fact that Titan can "hide" behind Jupiter for a part of the time. Something which Mars can't..The fact that you mention that Titan also has a dense atmosphere, but lower gravity than Mars further disproves your own thought that gravity is most important for holding the atmosphere