And if it's serious grass field operations, the 180 or 185 will be superior to the 182. I have buried a 182 nosewheel in soft ground before. That said, if the conditions of the grass runway are such that the nosewheel is getting mired in, the operator of the runway might prefer that there be no traffic until it firms up, so the ability of the 180/185 to get in and out might create unhappiness.
Comparing apples to apples, the 180 is a little faster, will carry a bit more, and is less costly to maintain than the 182.
The 182 RG goes the other direction compared to the 182, more costly to maintain, and not as good in grass runways, with the smaller tires. A great plane, but better kept to firm runways.