Could just use a t-handle (sliding bar) and an extension with a socket (1/4 if space is an issue). There are lots of ways to do a single job about 99% of the time.
Magnetic nutdrivers would be pretty useful though with recessed bolts but not 100 bucks a set useful.
I agree either can be used and there are multiple ways. Nut driver is not absolutely necessary, but they can be convenient. Typically I don't buy tools based on what I need or do any cost / benefit, but rather what will entertain me while at work. End up using multiple different approaches just to keep the mundane stuff a little bit interesting. The magnetic nut driver sockets are a good example of that one.
That set functions pretty much like a spinner with a socket. Besides the magnet function that I hadn't seen before, bought it for the ratchet and spinner with the ergonic handles. Screwdriver sets have those handles and love the feel of them. Both sets I mentioned are multipiece sets so there is same issues as using deep sockets and spinner at times, but need for portability outweighed those concerns.
Mentioned the sets because he mentioned he was looking to upgrade so figured price was flexible. For me, with something as boring as a nutdriver I had to get one with something with more than standard features and a little unique if I was going to be spending much money on them. If the handle fits your hand and they have hollow shafts to fit over studs, nutdrivers will all work about the same.
In reality, the Klein 11 in 1 screwdriver / nutdriver set does the brunt of my nutdriving work when time is an issue because its most likely to be on hand. 1/4, 5/16 and 3/8 on the same handle. Phillips, flathead, etc. If I know I'm wearing my electricians hat for the day, the full sets go in the portable bag.