If the farm/field can be planted early, pick the best variety for that farm/field. If, for some reason, the farm/field will be planted later, then pick an earlier variety. You will give up yield on the soybeans but will have a corn yield increase the following year.

If you are in an area of 2,800 CHUs or more, you can consider double-cropping soybeans after the wheat crop. The total soybean yield over the two seasons will be greater than picking a long-season variety. In the latter case, you risk not getting wheat planted in a timely fashion this fall after the soybean harvest.