Pretty sure when you only have a Cydia component or other core JB upgrade available, it doesn't matter which you choose. It is only in cases where another app has an upgrade also, like OpenNotifier has had a LibStatus file upgrade a couple times over the last few days, where it makes a difference which button you hit. Essential upgrades whatever Cydia considers essential, such as Cydia or SBSettings, and Complete will apply any other updates available too.
Sounds correct! I do have 3 updates waiting along with this new cydia--thanks