Buy what you can find.  You will never know the difference - it's purely preference in this day and age.

Gearing used to be an issue with mechanical fuel systems - but almost a non-issue for modern engines with flat torque curves. .   Go cheap and with whatever is available.  We have both and rarely split the top. 

THE MOST important aspect of any truck is the first gear and the top gear ratios (in combination with the final drive/tire size).  Never buy a truck you have to dump the clutch or floor the throttle to get it to the elevator.