Okay, we used to live near the area, and used to visit more often!
First, let us know kind of what you are looking for. What kind of accommodations and atmosphere. Rustic, or a bit more modern/upscale... an outdoors mountain vacation, or want to be right on the strip. Etc.
I have never stayed at this one before, but of the ones you mentioned, I like the Hilton Garden Inn. It is right in Gatlinburg... right out of their parking lot and up into the Mountains. But it is not right on that strip. If this matters, they seem to have some nice rooms/suites, some with fireplaces.
The Clarion should be nice. It is more of a hi-rise right on that 'strip'. Because of that, I don't think it has appealed as much to me.
I would rule out the Park Vista... (the big round one way up the hill) Last time I saw it it was just SO dated... not that nice... the heavy concrete balcony walls are just claustrophobic and really block the views, if you did happen to have a view. We looked at this hotel about ten years ago, as a place to host a big reunion event... have never been back up that road.
Like the prev. poster, when we stay overnight, we often stay there at Pigeon Forge, which has a lot to offer. You might not want to rule out Pigeon Forge.