They're both great boats, for their intended purpose. We love our 37.
Not sure what part of the world you hail from but there's a PSC34 available for charter up in the Apostle Islands of Lake Superior from Superior Charters
It was a boisterous weekend, but s/v Golden Sun took good care of us. That's when we decided to look for a PSC34 or PSC37.
Sounds like Bill B. in another thread is contemplating chartering out his PSC37 in the BVI's, so you may have chance to try both before deciding.