If you know that it is very common for you to go all summer with very little rain, high heat and humidity then a well is your friend. If you can run power to it and the costs of doing a stab well aren't too high then the advantage is you can fill when you want to. Ground water by you is probably closer to 60 degrees or higher temp year around? That cool water will be a welcome relief since most southern ponds struggle with keeping their water cool enough to maintain good oxygen levels. The pond boss Bob Lusk has taught us in his facebook live sessions that fish will prefer to suffer with lower oxygen than what they would prefer as long as they can hang out in cooler water. They'll go down into the poor quality water (oxygen wise) as long as they can keep their body temp where they prefer it. I think he referenced tagged bass in that experiment.

Ground water doesn't have a high oxygen content which won't matter if you have aeration as you can aerate the pond and the existing water will mix with the incoming well water. If you have power for a well then aeration would be easy to add. I would say aeration is really important in southern climate ponds especially where the existing water is the same water year around and little new water comes in from a creek, well, or from the sky. As it evaporates you also concentrate the other dissolved items that make up 'hardness'.

If you have access to ground water and no aeration just have it flow over some artificial steps, ledges or rocks to make it move and agitate and it will pick up air on the way in to the pond. Your pond looks beautiful and the grass next to it even more rich! Just needs a a few heavy rains and hoping they come your way soon.