going to cal state long beach now, starting my final year (been here 4 years)
many of my friends here do research at one of the UCI's lab for the same reasons people in this thread have mentioned. UCI and other UCs tend to be "research powerhouses." the labs there are huge, HUGE and have lots and lots of research assistants, usually grad students. as an undergrad, you will not get your name on whatever publications your lab puts out. the research at UCI, though, is more broad and so the topic may be interesting to you.
going to csulb lets you get published, even if the labs do not publish that often (some labs publish something like once every 3-4 years, pathetically, after 3-4 years of research) because the labs are smaller, they rely more heavily on ugrads, and some of them rely on bridge funding vs. NIH grants. but there are 1-2 labs (somewhat notorious/famous on campus) that pull in LOADS of funding from NIH and stuff (especially one professor she is insanely bright and insanely hard for lectures). these two labs publish very often (like 1-2 a year, not highest but you will get your name as the author and if you're here for 1-2 years, that's plenty of pubs for you).
these are biological labs i'm talking about. chemistry labs are different at csu, some of them are linked to biotech companies in irvine (the PI owns a biotech company) if you're looking for internships.
csu's tuition is also way less than UCs, but it's rising.
not saying which one is better, they are a little different, but just saying "UCs have better research" is true but a bit misleading
btw. check csulb's acceptance rate on us news
o.o
i'm sort of rambling cuz im writing this in class but... really look at what YOU want. their grading systems are much different, setting is somewhat different (csulb is urbany/oceanic/library has panaromic view of the ocean) irvine is super surburban (everything's slightly manufactured feel/very upscale). P.s. CSULB is not like other CSUs. it's HUGE student population size wise....
anyways, pick your schoolbased on something other than research
-undergrad researcher at CSULB
P.S. csu's don't get out +'s or -'s. an A is 4.0, b is 3.0
therefore, 90% or however in the class = 4.0, 88% is 3.0. also semester system vs. quarter system