Two points.
Firstly, the most successful, by sheer numbers and travels, recreational blue water MVs ever built are usually singles from 40' up to the 70' range. But and a very big but, they are all equipped with significantly sized get home engines with stand alone drive systems. So essentially a twin.
Secondly there is an ill placed but continually repeated misconception on TF that twins are poorly maintained with crowded ERs. Two comments - maintenance whether sail, power or rowboat is a decision made by the owner. Secondly, vessel design and size play a huge role in ER and systems access, whether twin or single. Kinda silly for the owner of a 30' single vessel saying that the ER of a 45' - 50+ twin vessel suffers poor access.
To the OP - have you read the boatdiesel archives for each engine? As usual, the devil is in the details. Good luck, either combination will work just fine with prior overall vessel maintenance not a small factor.
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