It's not so much the delta V needed for Europe..
The design environment is MUCH tougher. Mars is pretty benign radiation-wise.. 20krad total dose would be a typical requirement. Europa needs megarad total dose parts and even then, you might wind up with herculean efforts for shielding and fault tolerance.
The telecom problem is harder for Europa.. you're at 5-6 AU instead of 0.5 to 2 AU, so you need either need bigger antennas (tough on a lander), or a combination lander and orbiter relay, or bigger RF powe
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