Thicker cogs will last longer. Old freewheels last almost forever, before wearing out. When some people are thrilled to get 5,000 miles out of a 10/11 speed cassette, some old suntour freewheels are going strong after 50,000 miles.

As for ramps, and I could be wrong, I thought the single ramp cogs were for 1 tooth differences. If you have more than a tooth difference, 2 ramps work better.

John