<p>ucd has alot of available majors if you choose to switch, and all of their science majors (especially life sciences) are really strong so you do have alot of options at davis. the weather is ultimately better at ucsd seeing as its pretty spring/summer ish year round, however davis has actual seasons: hot in the summer, cold in the winter, and nice in between
i wouldnt say that either school is a real party school. actually from what ive heard ucsd is completely dead to the point of being down right dull. and their are parties at davis, but there are alot of other things that you can get involved in that dont involve partying. they have tons of clubs and school spirit and student involvement is really important their. the town of davis is cute but not too much to do in davis, however sacramento is pretty fun and thats 15 minutes away, and davis is also only a drive away from SF and the other great places of the bay area. they say davis is one of the last true college towns, and thats why im going there next year =]</p>
<p>however i dont know that much about ucsd, it really just depends on what you want out of your college experience</p>