I've had both Vertex 3 and Crucial M4 in my MBP 2011. Sometimes Sandforce is faster, sometimes Crucial is faster.
I think you make a good point here that deserves highlighting for modern SSDs in general.
Read this recent review from Anandtech where the test results below appear. Note how little difference there is between any of the drives tested when connected at SATA III (6Gbps n the chart). Anand says this PCMark Vantage suite is a good indicator of overall drive performance in real world usage.

IMO users should focus their search more on compatibility/reliability and manufacturer support and pay less attention to synthetic benchmarks. Based on the results of this Anandtech review I think any user would be hard pressed to tell the difference in a blind test with any of the newer SATA III SSDs.