For the lowest polygone model, you can trim off another 32 triangles, because you have four triangles in the end of the pegs between the legs, which is a waste. Also, give your pegs sides the same smoothing group, so it will be round. The seat shape has changed compared to the other models, should keep the same shape to avoid issues.
With the second model, you could weld the middle vertex to the side and save a couple of polygons. Depending on how it looks, you might want to get a bevel down the legs on the second model, to avoid issues with normal map.