Everybody's got their own preference, I'd guess.

But I would also guess the enjoyment factor would tend to go up, the lighter the tackle you can use to subdue your targeted quarry, without playing them to death.

For a recent fishing trip I took, I had read varying advice that suggested anything from a 5wt on the low end, to an 8 or even 10 wt. on the high end...for the same size/species of fish. I waffled back and forth, and eventually settled on bringing 2 rods, a 5wt, and a 6wt. I used them both, had no break-offs, and enjoyed every single fish. I'm glad I chose against the 8wt.
But that isn't to say an 8wt doesn't have its time or place!