1) A planetary atmosphere that we don't completely understand with pressures and temperatures rarely experienced on Earth, with no magnetosphere to protect it from the weirder forms of solar radiation, happens to have some sort of weird high pressure, high temperature, radiation induced chemistry that produces a chemical compound that is also produced on Earth by some organic processes
OR
2) A planet whose lack of a magnetosphere has resulted in the sun blasting away almost all of the atmospheric hydrogen, which means that many common chemical compounds such as water as only found in trace amounts, with temperatures and pressures beyond what would occur on Earth, is teeming with life
0
Which is more likely?
1) A planetary atmosphere that we don't completely understand with pressures and temperatures rarely experienced on Earth, with no magnetosphere to protect it from the weirder forms of solar radiation, happens to have some sort of weird high pressure, high temperature, radiation induced chemistry that produces a chemical compound that is also produced on Earth by some organic processes
OR
2) A planet whose lack of a magnetosphere has resulted in the sun blasting away almost all of the atmospheric hydrogen, which means that many common chemical compounds such as water as only found in trace amounts, with temperatures and pressures beyond what would occur on Earth, is teeming with life