Here's my favourite ratcheting screwdriver that I've been using. It's a Megapro. Made in Canada. Its racheting is precise and smooth, and the rotation selector is firm and direct (best I've felt, and I've tried the common SO/Williams/Bahco, SK/Facom/Bost and KTC brands). The shaft has minimal play, provides adequate grip, and a good selection of double-sided bits that are securely mounted on a rotatable shaft.
Besides holding more bits how does it compare to the Snap-on one?
I have two Williams/Snap-on phillips head screwdrivers (ACR tips) and the profiles are horrible when compared with the Taiwanese-made tips contained in the Megapro. But we all know SO is notorious for having poor quality standards.
If you want to compare the handle to the most common hard-handled ones, the Megapro will offer you more torque. I think the Megapro handle diameter is a tad larger than the SO.
The backstroke on the Megapro is lighter than the SO mechanism, and it just sounds more "quality". The sound part is subjective though, but I just think the ratcheting feel is more precise....if that makes any sense.
There's no knurling on the Megapro shaft, but that doesn't really bother me.
Hope that helps.