For instance, we hunt in South Louisiana. Some of the rice fields are a holy terror. 3 foot tractor ruts, sheet water, etc. I think from my experience that a taller/"bigger" dog has an easier time negotiating the terrain than a shorter/"smaller" dog.
On the other hand, if we're hunting the marsh where the bottom is very soft, the shorter/lighter dog seems to be able to glide across it much easier than than the taller/heavier dog. Walked those marshes many time where you take a step and the boot stays in the mud!
If you need someone to block, you get the lineman. If you need the speed, you get the WR. To each his own. There is no better dog.
Side note: I had a high school history teacher we called Coach Mo. He was a sports dictionary. We used to try and stump him with a baseball almanac...