My most used is the ratcheting hard handle Snap-on's. Beyond that, I like my old black and yellow handle Snap-on hard handles. Like my flat blade Klein's also, but use them almost exclusively for electrical work, they reside in my electricians tool belt. Might use them more if I had more of them scattered into my mechanics tool box. But, I use a snap-on Phillips in my electricians belt, I like the flat blade Kleins, but not phillips. I have quite a few Proto yellow handle, but do not like them as well as Snap-on. The phillips do not grip as well. I think that the Snap-on grip better than anything else I have ever used, particularly on rusty or deformed fasteners. I have a lot of odd brands, particularly in flat drivers. Most of them work okay, the ones that bend or break get relegated to use as tent pegs quickly. Some that have lasted well are old Vermont American, Dunlap, SK and Indestro. I really like a maroon/red handled Mac one in my box, but it's handle is essentially identical to the Snap on black handles, so I see why. Oddly, I like my Craftsman nut drivers better than the old square handle Snap-on ones I own. The handles feel better; the Snap-on ones are too small and give me blisters if I use them a lot.
There's two things in drivers that make them right: How well the tips grip and hold up, and how the handles fit your hands and your usage. In my case, those two things align best with Snap-on for most of my drivers.
Some brands, the handles that feel good are paired with blades that bend or break so they get thrown out. Some, like the common clear/blue/red handled Craftsman that are so cheap and easy to get have both bad blades and handles that raise blisters on my hands. The phillips ones of those I have owned have often stripped out on the very first fastener I tried them on. I only have one of those Crafstman left, it's a huge flat blade one I use for stirring paint in cans; it's also handy for opening those cans and hammering them shut. So, even the bottom of the heap have some usage!
