If you are playing Oldrim/LE, I would still stick to MO1, if you are playing NewRim/SE than MO2 is the right choice.   Reason behind my carefulness is that MO2 was not meant for Oldrim. And it is said to have some hickups with it. So if you are starting fresh and new anyway, the reliable path is MO1 instead of MO2 ...   But that's the voice of carefulness speaking to you.