Galactic Power Value per credit - mods vs character levels?

So how do you factor in pilots (or fleet commanders)? Does upgrading a pilot increase your total galactic power more than the same upgrade to a non-pilot? Is there a similar constant relation between upgrades and power boost.
The power rating of a ship depended to a large extent on the power rating of the underlying pilot. If that is still true for galactic power, then one might want to prioritize upgrading pilots? Of course maybe they count ship galactic power separately from other galactic power.
Thanks for working some of this out.