Have a good long think about your capacity for risk.
Both paths provide you with excellent choices, but Boulder represents a clear ‘bird in the hand,’ as long
as Boulder remains affordable for all four years. The UC/CSU represents a lower-cost, but less certain proposition.
Some people are risk takers, others find it too stressful. Which are you?
That said, should you decide on the CC>UC/CSU route, be sure to meet with a Transfer counselor at Cuesta prior to
registering for classes. The UC’s and the CSU’s have somewhat differing admission requirements.
The engineering requirements for departmental UC admissions (at most of the schools), do not require a tradition CC>IGETC course progression (which they waive). But not fulfilling all of the IGETC requirements may make you ineligible for CSU admission, unless you extend your time at Cuesta (summers? another year?) to take all of the requisite classes. Again, these issues are easily sorted by a Transfer counselor, but it’s best to register for classes with a clear path in mind.
I like the suggestion of MYOS1634 above, who said go to the area around Cuesta and see if housing is even possible or financially practical. The housing shortage in or about many CC’s is of concern, since most CC students already live close to their campuses. The housing issue could make your decision for you.