Well reading here: http://www.bit-tech.net/hardware/storag ... -face-of/1
Makes it sound like the Crucial is a pain in the ass to set up compared to the OCZ:
Crucial M4 Firmware Deployment
Crucial’s latest firmware is available as an ISO file, which can be burnt to a CD or DVD via Windows 7’s integrated Disc Image Burner. You’ll also need to move your SSD port 0, 1, 2 or 3 on the motherboard, and set the SATA configuration from AHCI to IDE, before booting from the disc.
The flashing process takes a few minutes (we found it was much longer when flashing the larger 256GB version), and flashes any retail M4 SSD to the latest 0009 firmware. The firmware updater can process multiple M4s at once, and from our experience, doesn't reformat or damage any files on the drive (although you should still backup irreplaceable files before updating regardless). Once updated, switch your SATA configuration back to AHCI and the drive will boot up, complete with the new firmware.
OCZ Vertex 3 Firmware Deployment
OCZ deploys its firmware via its increasingly capable OCZ Technology Toolbox software, which doesn't require you to change BIOS settings or burn disc images. The application runs in Windows, automatically detects eligible OCZ SSDs connected to the system, and then downloads and deploys the firmware. It’s also able to give you information about your SSD’s usage, and perform a secure erase of the drive.
It’s certainly less of a fuss than the M4’s updater, but it can't be used to update the firmware of the drive from which Windows boots; for that you’ll need an alternative install from which to update the drive. As with the M4’s updater, data on the drive wasn’t damaged when we updated its firmware, but you should always make a back-up regardless, as any firmware update carries a (very small) risk of bricking the drive with it.
The conclusion was the Crucial being cheaper and matching performance after the firmware update meant it was a no brainer to choose. But the 120/8GB are near enough identical in price so it's a non-issue. The benchmarks appear near enough identical throughout. Leading the main difference between them that updates to firmware can be done via Windows rather than a more roundabout method.