With DD reducing footprint weight is absolutely key when wet, or you may as well not bother.You reckon? We had two identical 200hp tractors up until July this year, one on 20.8r42, the other on 620/70r42.
The one on the 20.8's would run rings round it's mate when it came to putting the power down, it's superb. The one on the wider boots didn't cut in as much in soft going, but would lose traction far quicker.
The masters of drilling in the wet (team triton) would advocate at least 100hp/m, and tracks.
Personally? I'd go for the widest mounted GD you could - so you can at least achieve some weight transfer, and get yourself out of the poop when everything grinds to a halt. On tyres just wide enough to hold you up.
If it's so wet you can't pull it with wide or duals, put it back in the shed because it's far too wet and the seed will rot anyway.