Depends of your budget and preferences. Do you need and can affort very fast SSD or bigger capacity will make you happy enough? Samsung 970 EVO Plus might be something you will appreciate for performance, capacity and reliability.
I have a Dell XPS 8930 with a  M.2 512GB PCIe x4 SSD and would like to upgrade to a 1tb drive. Does anyone have any suggestions on good one to buy
XPS 8930, 1TB SSD upgrade