Which one is better? (long)

Your 5.9 came with a 904 ? Gas tank wise. To do it properly and safely will cost you $500-$700 to either convert a new standard tank to EFI or for a new complete tank and pump new and built for EFI.
Fuel system is nothing to shortcut. Do it safely/correctly.
Many companys with new products to convert the early Mopars to EFI.
Replace all fuel system hard lines, braided for any flw line connections, steel fuel filter and F.I. rated clamps/connectors.