According to the newest benchmarks provided by Linux-focused website Phoronix, the EXT4 filesystem for Linux has gained some improvements as far as data loss goes with the latest Linux kernel — but at a cost of a significant drop-off in performance.
Now obviously we aren't saying you should reformat your system right now, especially since eventually EXT4 will definitely be the better option all around — but if you're the type that likes a fresh, reformatted install of your OS every six months or year, you might be better off sticking with EXT3 for the next cycle, as it may be a few kernels before EXT4 has optimal performance again. Hit the link for the full article and test results. Thanks, TheFu! [Phoronix]