When comparing V8 Benchmark Suite vs SunSpider, the Slant community recommends SunSpider for most people. In the question“What are the best browser benchmarks for JavaScript?” SunSpider is ranked 3rd while V8 Benchmark Suite is ranked 4th. The most important reason people chose SunSpider is:
This benchmark tool won’t show you any arbitrary numbers as a result, just the time it took to take each individual test. This is very helpful since it gives you a more detailed view of what is happening behind the scenes and how each browser handles each test.
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Pros
Pro Very fast
To understand how fast this benchmark test is, all you have to do is to open the page. It will immediately give you the score based on it's numerous tests.
Pro No arbitrary numbers as results, this makes the tests easier to understand
This benchmark tool won’t show you any arbitrary numbers as a result, just the time it took to take each individual test. This is very helpful since it gives you a more detailed view of what is happening behind the scenes and how each browser handles each test.
Pro SunSpider focuses on real world problems
Unlike other benchmarking tools, SunSpider completely avoids using microbenchmarks, which attempt to test the performance of a "small" amount of code at a time. Instead, SunSpider mostly tries to focus on the problems developers face with JavaScript today, such as generating a tagcloud from a JSON input, 3D raytracer, cryptography tests, code decompression and many more.
Cons
Con It may be a little biased
Based on the fact that it's made by Google, one of the big guys in the so-called "browser wars" may lead some to think that it may be a little biased towards giving Chrome better results.
Con As browsers get faster, tests may become too easy
Although considered by many to be the most comprehensive benchmark tool out there, the fact that it avoids using microbenchmark to test the code efficiency means that as browsers start to get faster at running day-to-day tasks, SunSpider's tests may start to become easier, especially compared to tools that use microbenchmarks.