This is a complicated balancing act. See: http://www.renewableenergyworld.com/rea/news/article/2011/12/value-of-csp-increases-substantially-at-high-solar-penetration
This year, PV is widely seen as winning the competition with CSP, even though CSP has some advantages. Sometimes a promising technology fades away in competition was something that is good enough and becomes widespread for various reasons unrelated to quality. Over the years a lot of money has been invested in PV. This has dramatically driven down the price. Even though this may not be the best solution for all applications it will probably win out. Robert Cringley pointed out that most markets can only support one or two major standards, such as the PC and the Mac, or back in the days of record players 33 rpm and 45 rpm. There are various reasons for this. One is that people working in the field can only master one or two variations. A computer programmer might be adept at PC plus the Mac but it becomes a stretch to also master other operating systems, and to maintain software in them. There are not enough people and not enough talent to go around. - Jed
