You can also run them 'against' each other, but do not be deceived - just because one algorithm seems to run faster here, it is not clear that this is acutally true.
(At least in my Web Browser, the Java Virtual Machine is not entirely fair in it's scheduling of the threads). But it if fun to watch them work. The number they display at the end reflects, how often two array elements were compared.
If you are curious, feel free to have a look at their source code.