Nobody can really answer this question for you without more context, and even then it will largely come down to your own preferences/priorities. There is no best really, its very much an apples, to oranges, to peaches comparison.
Do you think you would feel comfortable taking responsibility for researching and learning what you need to learn to safely build your own battery and protect your investment? And are you comfortable taking some amount of risk buying from China directly? If so the 280 Ah EVE cells are by far the best value, but there is more risk involved.
Are you willing to pay top dollar for a well engineered product, backed by a solid warranty from a reputable U.S. based company? Do you like the idea of not having to think too hard about your batteries, and having minimal setup? If so, Battleborn probably makes sense, but will cost a lot more.
Note: I think you have the price wrong for Battleborn. The 24v 50Ah battery is ~$1000