I disagree.
Mon pools upriver are much nicer than Allegheny. Up around 10-mile, the Mon is just beautiful. Been as far as Brady’s Bend on the Allegheny and water has always been more muddy. It’s nice further north than that but not really navigable in a motorboat.
Not just that, but after most storms that pass through both origination points, look at the tip of the Ohio and see where the muddy brown water is coming from, and see where the more clear / less-silty water is coming from.
Muddy= Allegheny.
I always though the Mon was worse growing up because of the industry and the fact that we docked in an Allegheny pool.
Now that I live south of the city, I’ve found that the Mon, once you get past Elizabeth especially, is much nicer IMHO.