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After lengthy consideration, I went with the delta. My particular trike has one wheel drive. After the first outing I put a knobby tire on the drive wheel. I have always made sufficient traction ...
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#1: Initial revision
After lengthy consideration, I went with the delta. My particular trike has one wheel drive. After the first outing I put a knobby tire on the drive wheel. I have always made sufficient traction to move forward. Yes it is possible to spin the traction tire in some scenarios, it is also possible to apply a little less force, get traction and move forward. The other consideration is towing connection. Off the shelf solutions are more available for Tadpole as it has the same configuration in the back a normally bicycle. Home made solutions (IMHO) favor the Delta. I don't think either Delta or Tadpole has a strong advantage. [Example towing a canoe with a trike](https://outdoors.codidact.com/questions/49136#answer-51494) <p><a href="https://i.stack.imgur.com/PkDVm.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PkDVm.jpg" alt="Trike towing Canoe"></a></p>