6 TB- Choose this if you are getting the computer for work use, always pick the highest amount of storage for everyday use.
2TB SSD- This is the worst option because its the least among the others, but if you were just a game this may suit you.
500 GB SSD with 4TB- This would be the best option for someone who games, edits, or does graphics, because you get the storage but you also get 500 GB of SSD to load your software on, which will help it launch faster and run smoother.