Subjectively, there are any number of reasons why a particular student might prefer UCD over Purdue or vice versa. Objectively, I don’t think there’s any way to argue that the academic opportunities for a CS major at Davis are worth $25K/year over Purdue. If anything the CS offerings at Purdue are more extensive, although the vast majority of CS undergrads could get everything they wanted or needed at either school.
At cost parity it would be a matter of fit and preference. But for what you’d save at Purdue, you could pursue a masters program at the UC of your choice, if you were so inclined.
Davis could almost be thought of as the Purdue of the UC system - top-tier ag school while also very strong across the board especially in STEM. If you were a CA resident I’d vote Davis, because it’s a great school with a great student quality of life; but for the OOS differential I don’t see what all the extra money is buying you other than California vs. Indiana if that’s important to you. But Purdue CS grads get hired by CA companies all the time, so its just about where you want to be for college, not a matter of needing to be in CA in order to get hired there.
Of course, if you can afford it and want to help prop up the fiscal health of the UC system, we CA residents will thank you! But if it were my money, Boiler Up!