When looking at the 2GB read performance with IOzone, the performance was virtually the same across all six tested file-systems at 28~29MB/s.
Next up we have the results from Dbench when running a varying number of Dbench clients from 1 to 128. Aside from Btrfs that seemed to perform better than the other file-systems when the client count was increased beyond six, for the other file-systems their performance similarly degraded. XFS had started out performing the best with just one client while Btrfs performed the worst, and EXT4 came in for a second place position.
The FAT32 file-system actually had a win when it came to the random write performance via AIO-Stress. FAT32 was sustaining random writes at 7.12MB/s while in second was EXT4 at 3.80MB/s and then EXT3/XFS/ReiserFS all were less than two megabytes per second.