We have a pretty good rack of both. The thing you'll notice most in dropping from a 3 to a 2 is loss of casting distance. You really have to work at it to get a 2 to reach very far, but a 3 will not be that much of a departure from what you can do with a 4 or even a 5. But that's not a criticism! In fact a 2 will give you even more fun than a 3 for small casting waters, generally less than 40', and certainly less than 30'. You'll also make trout and other fish "grow" quite a bit with a 2. We fish for pink salmon (3.5# average) quite a bit with our 3WTs, any time it's not too windy. They give a satisfyingly long cast with the same streamers we throw with 4WTs, and they fight the fish well.
When we first got the 2WTs, I naturally tried them on the pink salmon. They wouldn't turn over the same flies so well, and I had to drop to smaller, lighter versions. When it came time to brawl with pink salmon, I have to say that the 2s were over-matched. You could do it, but fights lasted so long it really tired the fish excessively.
I have the good fortune of a long relationship teaching fly fishing classes for a local sporting goods store that stocks full lines of Echo, Temple Fork, Loomis, Scott, Winston and Sage rods. Before buying the 2's I availed myself of the privilege of casting their demos with a variety of lines. My wife did the same. Our casting styles and expectations of rods are quite different, yet we came to the same decision on those spindly little 2WTs. The
Temple Fork Finesse rods beat the pants off everything else for distance, accuracy and power for fish fighting. That included the
Sage Little One at $850. That's quite a statement when the Finesse retails for $189. You could buy 5 of the Temple Forks for about the same cost as a single Sage.
The store manager is a very good fly fisher and frequent fishing partner. He couldn't believe our selection, so he went back out with us to do it all over again. He now owns the Temple Fork Finesse, too! A couple of years fishing with the Finesse now is yet to make any of us regret the choice.