Both are good products.
1 & Done will cut more, both finish down very well. From my experience, 3D One is heavily lubricated which is beneficial if you're doing long buffing cycles in direct sunlight, but due to the oily nature, wipeoff requires a tad bit more effort.
3D One has more of a chemical scent and 1& Done has more of a fruity scent if that matters to you.
Currently it looks like 1 & Done is going for around $22 in the 16 oz container and 3D one is going for around $29 for 16 oz.
Bottom line is both are fantastic products and work very well, it all depends on what your needs are. I personally prefer 1 & Done.