I have used bubble pads with borium. My logic for it is that I don’t want to cripple him with giant balls of ice in his feet, AND I was most particularly concerned that he wasn’t going to slip and do a split or something and be injured. The first farm I had him at was a steep icy hill between turnout and the barn, so that was imporant to me. The bubble pads were mostly so I could still ride him in the snow.
I have been happy with this as a winter protocol, to date. This winter, he is on lease in Rhode Island, and basically will be walking from barn to indoor, all of about 25 yards, on level ground. He won’t be ridden in the woods or up and down the driveway, only in the arena, and lessor and my trainer have advocated to give him a couple months off with no shoes. So this year, I’ll see how he does. I got the horse with flares and an old abcess and flat soles, so I am not particuarly convinced he should go bare (basically 'if it ain’t broke, don’t fix it kinda thing) now that his feet are really fantastic, but its a more simple environment and might be okay, since they feel strongly about letting him have some time off without shoes.
So in summary (sorry to be long winded on the topic) I say if he needs the traction for his safety and well being, shoe him up. As for pads, if you want to keep snow out of his shoes, bubble pads worked really well for us. Horse never took a wrong step with borium.
Cheers