Kind of pointless question. If all you want is flops the newest CELL processor, not the one in the PS3, does an amazing number of flops -- it is in the 100s of gflops if I recall. It is used in IBMs flagship super computer today which is number 1 at top 500.
If you want more detail as in which will solve your application your out of luck when it comes down to an easy answer. You need to know your problem pretty well, you need to know the rest of your hardware, and you need to know your compiler. Some problems can not be split and solved in parts and therefore just depend on your single fastest core to solve. Your other hardware is going to play a role in most real world problems. Your compiler quality is also going to make a big difference, internal optimization on the part of the compiler can make a big difference in how well your code runs.
The complexity of answering this question is why rankings are done not one theoretical maximums but on running some actual program. Top 500 uses the Linpack benchmark, various PC review sites use a variety of tools. Linpack though you compile yourself so it can take advantage of your compiler optimizations while downloaded benchmarks used by PC testers leave out that feature but in those cases they are using similar CPUs where CPU-Compiler response should be similar.
You really want to test this get a new CELL based machine and a Quad core with the rest of their hardware as close as possible. Get the best compiler, for the Quad core I would recommend Intels or PGIs -- not sure on the CELL, for each and then compile and run LINPACK. Your not going to get anywhere near a super computer but it will give you some basis for comparison.
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