As for what my favourites are... If we say one brand, it would be Vessel, but they offer so many superb handle shapes.
Vessel crystalline is super comfy in the hand.
The powergrip is amazing too.
And the 230W is my favourite bit driver, the ball grip is very secure in the hand though I'm no big fan of soft handles.
Also, fair to say the megadora fits in the hand super well too. As I said, soft handles are not my thing, but I easily understand why many people love the megadora. Much more so than Wera - feel like they are overhyped everywhere, they must invest a lot more into advertisements, but the Wera handles are just a huge disappointment to me.
The others I like are the Oplast screwdriver shapes, sold under Gedore and Hazet.
And of course, the shapes made by PB Swiss. They are very well thought out. I like all three designs they offer. Very well thought out and fit in the hand well. The classic is the "odd" one out, but it is hard not to appreciate that shape, it's a classic for a reason...
