This has been covered ad nausium but the simple answer is that not all phono stages can handle a low output MC but about all can use a high output one. MOST think that sound of the low output is better if your phono stage can handle it; some like HO better. Check the archives for far more than you want to know.
One more important point: Low-outs are less sensible to RFI or EMI or turntable motor noise. The tolerance in phono preamps to EMI or RFI may also come onto the game with low-out MC, but the implementation of proper EMI or RFI tolerance on the circuit board isn't rocket science nowdays.
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