There's just *not* a best. Even for the same fastener on the same job. How many torque-to-yield fasteners need stupid torque to just break free.... but then you can immediately get them off with fingers or a stubby ratchet? There are the suspension jobs where you gotta work a cruddy bolt free, but its replacement is easy.
Half-inch drive covers such a big range of "oomph". Literally 0-250+ ft-lbs, so you need a range of handle lengths and styes to work efficiently.
Rather than "the one" really nice ratchet, I'd opt for a good set of lesser ratchets. GearWrench sets are a lot of bang for your buck. It'll inform you on what fits your hands best, and what tools you use most. Then, when you have the money or when something wears out, you can replace it with something "nicer", and you'll have figured out your personal preferences so you can make informed purchases. I'm glad I went this route myself.
...Or you can just pull out the credit card and go for broke right away. Buy a whole set off the tool truck, and sleep on the couch for a few weeks, and a year or two later quietly kick yourself every time you look at that one ratchet you never use.
-Ryan