Guess it depends on the length of the drive. I find that snow doesn't clear off the front of a loader bucket very well. Snow tends to build up ahead of the bucket, and it doesn't take long for my traction to fail. Then, I have to scoop and dump a few buckets to the side and continue. I am using turf tires, which have considerably less traction than ag's until the gravel freezes. After freeze up, there's less difference in the traction of various tires.
Snow comes off the ends of a moldboard blade or plow better than a loader bucket. Many blades also can be angled, and then snow is pushed off one end to the side of the drive. Generally, I think blades are meant for the job, but loaders are just a fill in. Still, somebody recently said they cleared a 1/2-mile drive with a loader last winter. Loaders do work for some people.
Myself, I use a blower, but I use the loader before the gravel freezes. The bucket can be curled up so the blade doesn't tear up the gravel. A blade can do a lot of damage to a gravel drive before freeze up. Skid plates often just sink into the gravel, which leaves the blade to dig holes in the drive anyway.
The skids on my blower sink in, and I get showers of gravel before freeze up, which is why I use the loader. There are enough hills and dips in my drive so trying to keep a blade or blower off the ground with the 3ph a challenge.