Comparing Big U to Great Loop.
Inland cruising vs offshore cruising. The boating on the Great Loop is much easier and the trip is shorter.
Great Loop you get to see all of the Eastern US and all the beauty and diversity. Big U you get the West Coast. From Washington to San Diego has incredible cities we loved seeing, but from a cruising standpoint doesn't compare to the East Coast.
However, on the Big U, you get to experience more of the world, more countries, more unique environments and cultures. As different as areas of the Great Loop are, picture a continuum of some sort and the Great Loop has 1-7 but all of 8-10 are also available on the Big U. There are experiences available on the Big U that just aren't there on the Great Loop.
The Big U can be challenging boating wise in that it may require some overnight cruising. It also becomes expensive as you pay for the Panama Canal and you pay to clear into each country. There are boats I'd do the Great Loop in that I wouldn't try the Big U in. On the other hand, many boats on the Big U can't do the Loop.
Some of the adventure of either depends on where you've traveled before. For the Great Loop, we'd traveled the East Coast, we'd traveled the gulf coast, even had been on the TN River once, but we'd never been to any of the Great Lakes or the Mississippi or even the Erie or to Niagara Falls or Toronto.
Now, for the Big U, we'd never been anywhere on the West Coast, never had traveled to Mexico or any of the other countries we hit so that was all new. And when I say traveled, we hadn't been to those places by land or water.
Thing is there is so much to see and so little time. You just choose what fits your style and desire.
Also depends on number of people. If there were only two of us aboard, the Great Loop is far more conducive to a nice pleasurable trip than the Big U is. We had the benefit of extra crew on the Big U that makes a huge difference.