If memory serves, the KA-C is a standard entry level laminate mahogany ukulele, a small step up from Kala's entry level MK-C (I own a MK-CE). If you are going for budget with similar sound, put the MK-C on your list of Kala choices, too.
The SCG has a solid spruce top and gloss finish, and should be a significantly louder ukulele than the KA-C (Spruce projects as a tone wood). While The Ukulele Site has been cutting back instruments that they offer through their website, the KA-SCG is still listed ($157), which tells you something about how they feel about it--they no longer carry the KA-C on their website (although it is likely still available in their store).
Good luck on whatever you decide!