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Ultimately Titan is the more "doable" as you don't have to melt your way through a huge block of ice. Once through ice, you are on whatever battery power you have left. Titan, you just put out a parachute and either land on dirt or land in a methane lake and pop out a life raft. With all the methane floating around, maybe they can utilise this as a source of energy to power the craft for a long period of time. Having done Titan...they would be in a better position to know more of the problems they may encounter at Europa, and be more likely to succeed.
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