This depends on what you mean by 'better'. You can rate these based on anything at all...transfer rates, classes offered, distance, etc.
It all depends on the meaning of what you refer to as 'better'.
For transfers, I'd say that RCC would be best. The California Postsecondary Education Commission provides the following data:
=============Riverside Community College=============
09/10 - (382 UC transfers, 649 CSU transfers)
Seems like a great college to attend to transfer to UC Riverside (no suprise here!). Others include CSU Fullerton and CSUSB.
=============Chaffey Community College=============
09/10 - (82 UC transfers, 513 CSU transfers)
Seems like a great college to attend to transfer to Cal Poly Pomona and CSU San Bernardino
=============San Bernardino Valley College=============
09/10 - (27 UC transfers, 224 CSU transfers)
Seems like a great college to attend to transfer to CSU San Bernardino (not suprisingly)
information for this data could be found here: California Postsecondary Education Commission -- Transfer Pathways
I personally am a student attending RCC, and the classes offered span between the three campuses of Norco, Moreno Valley, and Riverside.
Keep in mind that in the end, your transfer depends on you!
Hope this helps.