The Tactical Solutions aluminum barrels will not feel the same as a Ruger 5.5" or 6 7/8" steel heavy barrels. The balance and handling on a 6 7/8" steel heavy barrel, a 4" steel bull, and a 6" aluminum TacSol will all be very different.
Sight radius advantage is a real benefit, but only if you're shooting open sights. Throw a red dot on top, or other optic, and you'll have equivalent aiming precision potential in any barrel length.
Accuracy advantage of longer barrels isn't imaginary, but for 90% of shooters in 90% of their applications, the difference will be moot. I have 4.75" tapered barrel Ruger Mark I and II's that shoot incredibly well, despite their marked lacking of muzzle weight and short sight radius. Can I milk better accuracy out of 10" bull barrel? You bet. But I have to try pretty dang hard to be able to tell the difference, especially for off hand shooting, and most of the time, either are accurate enough to do what I need of them.
Personally - for a heavy barreled, full size, rimfire pistol, I'm not thinking about any type of tactical or defensive application, so a 4" barrel isn't an advantage. For a usable belt gun, target arm, and small game hunting pistol, a 6" barrel makes much more sense to me. No bunny or squirrel will ever be able to notice the 50-150fps gap between a 4" and a 6", but the shooter often can.
I'd rather have a 6". My "go-to's" out of a few dozen Ruger Mark I/II/III pistols are a 6" tapered Mark II Standard Stainless and a 6 5/8" slab sided Mark III Competition.