The DXG-1 costs $129,000 so AWS is cheaper unless you need to do it 22 times. And you can have multiple instances running at once and get all of your results in ten days, instead of waiting ten days again for each run.
V100 has ~50% higher memory bandwidth than 2080Ti, so you probably wouldn't get 80% of the performance. Also, only two 2080Ti can be connected via nvlink.