I would prefer meters or yards specifically because their numbers = squares. So there's no calculations required if you decide to move to the grid. If a spell is range 50 feet... you have to do the math to come up with 10 squares (double the number and remove a 0). Whereas the spell would be 10 yards or meters, which then equals the numbers of squares it would be when moving to the grid.
If you have to use 5 feet... then I hope all ranged have the square equivalent right after. Range 50-200 feet (10-40).
If you have to use 5 feet... then I hope all ranged have the square equivalent right after. Range 50-200 feet (10-40).