The claim above that California is a better place to live then Oregon is opinion based, and both California and Oregon, like any other state, has its advantages and disadvantages.  
However, there are statistics that can provide more insight into influencing this opinion.  
For example, the costs of living are much higher in California than in Oregon.  According to Nerd Wallet’s Cost of Living Calculator, when comparing Portland, Oregon to San Francisco, California, housing costs are 80% higher and food costs are 14% higher in San Francisco.  Overall, the cost of living in San Francisco is 42% higher.  The financial difference may be a drawback to some, but for others it is a sacrifice they are willing to make in order to live in California. 
Aside from finances, there are other differences that can be used to compare the 2 states.  According to Wallet Hub, in a ranking of happiest states in the US, California ranks 7 whereas Oregon ranks 39.  In a public school ranking published by World Population Review, Oregon ranks 31st in public school education and California ranks 32nd, which makes them very close. 
Overall, the claim that California is a better place to live in Oregon remains an opinion based statement, but using the statistics above, it can be used to help compare and decide what state is the best personal fit.
Sources: 
https://www.nerdwallet.com/cost-of-living-calculator/compare/portland-or-vs-san-francisco-ca 
https://wallethub.com/edu/happiest-states/6959 
https://worldpopulationreview.com/state-rankings/public-school-rankings-by-state