I would go with a 2TB with the current prices. The 4TB will only get cheaper in the future and that 2TB will last you a while till prices come down. I was in the same situation when I bought my son his PS5. We went with a 1TB SN850X. At the time it was roughly $180 and it lasted him a year before being filled up. A year later and I upgraded to the 2TB version for $150. So start with the 2TB and down the road you can always upgrade.