Wetlands are of lower agricultural potential due to high water table, not economically to drain,poor aeration and water-log but could useful animals and birds habitation.

Both varies based on the crop type to be grown, fertility status, and season of cultivation. For instance, wetlands are best sites for carbon store and rice production but not suitable for upland crops. Wetlands are the major potential sites for off season crop cultivation. So, it too hard to conclude wetland is not suitable for agriculture. Soil wetness alone cannot ensure suitability of soil for agriculture.

Wet soil is more favorable than water logged soil as it allows more aerobic organisms to interact among each other including plant  roots. Wet soil is bio-physically more suitable for nutrient exchange and storage. Wet soil is definitely more suitable than the dry one.

To me, both wet soil and wetland impairs air movement and affects aerobic microorganisms. Wet soil means water saturated soil, in soil physics. Their difference is period of saturation. Wetlands are long lasting and almost permanent water storage sites. Whereas wet soils may or may not be part of wetlands. But don't be confused between wet soil and moist soil. So, the question by itself is vague and contradictory.

Wetland is a land area that is saturated with water, either permanently or seasonally. Here water covers the soil or is present either at or near the surface of the soil either all years or varying periods of time during the year. Anaerobic organisms are dominant here and you may choose the plants which grow well under stagnated water conditions.

Soil can be wet because it is compacted or became a high water table, where the upper level of ground water is near the soil surface. Mostly aerobic organisms are dominant here and you may choose the plants here adopted to wet conditions.

Therefore, I think it is foolish to compare both the situations as both have their own advantages and disadvantages.

Useful discussion..

 Wetlands can be defined by having wetland vegetation (hydrophytes); hydric soils, and wetland hydrology. Wetlands are areas where water covers the soil, or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season. Water saturation (hydrology) largely determines how the soil develops and the types of plant and animal communities living in and on the soil.Tidal wetlands in the United States, as their name suggests, are found along the Atlantic, Pacific, Alaskan and Gulf coasts.Non-Tidal wetlands are most common on floodplains along rivers and streams (riparian wetlands), in isolated depressions surrounded by dry land (for example, playas, basins and "potholes"), along the margins of lakes and ponds, and in other low-lying areas where the groundwater intercepts the soil surface or where precipitation sufficiently saturates the soil (vernal pools and bogs).Sometimes these non-tidal wetlands are called “upland wetlands”, “fresh water wetlands”, or “inland wetlands” to designate them as occurring in areas not influenced directly by coastal waters.

Wet soil on the other hand,  is more friendly for crop raising , could have moisture excess of crop requirement for a limited period only . but , the conditions like anoxia hardly prevails. so , i feel, two soil conditions are contrastingly different , though , in both the soil conditions, moisture has a over-riding role to play ...

Wetlands have excess moisture condition for the longer period of time during the year and may vary depending upon the locations and are generally naturally saturated lands while wet soils having excess moisture condition for short period owing to natural or man made. Wetland condition is mostly prevalent in uncultivated or unused land  however wet soil may be found in cultivated land. Therefore, in wetlands those wild species of vegetation  survive which prefer excess  soil moisture but in wet soil crops should be chosen according to their tolerance against  soil moisture condition. 

Wetlands refers to marshes, swamps and floodplain with high amount of clay content and poor drainage that is responsible for prolong wetness that has metamorphose to naturally saturated wetlands.

Wet soils surely have much greater agriculture potential compared to wetland..

Wetlands are very different. This is problem and opportunity for crop cultivation depends of a lot of factors, such as: peat layer and decomposition, acidity, water table level and so on. It is better to use it for special crops like reed of . You should also thing about biomass using: for forage, hay, energy and str. Problem of wet soils connected with their structure. As a role they are heavy, clay with bad penetration and oxygen regime.  The special melioration should be done. If you may solve this problems you may use it for most agricultural crops. 

Wet soil is better for agriculture actives instead of wetland as wetland are biodiversity rich zone but wet soil is favourable zone for agriculture.

What is the purpose of question/ research. The proper answer can only come , if we the objectives of research.