The colleges at UCSD are more like six different liberal arts colleges, each with its own philosophy and general education requirements, but each offering all the majors available at the university. The major requirements are all the same, but the general education requirements are not. You need to investigate and see which philosophy and set of (transfer) requirements fits you best.
I graduated from Revelle. It is NOT the typical choice of engineering majors. Way too many GE requirements. I chose it because I was entering undeclared as a freshman and wanted to take some of everything. It was a great experience.
The colleges do not have different rankings.
My diploma has both the name of the university and the name of my college.