Really in all reality your not going to see a speed difference between journaling enabled or disabled. No journaling they say is better for prolonged chip life of the device but we will probably never see a chip/memory failure even with frequently flashing and usage for the average 1-2 yr lifespan that most users keep a device before upgrading. There was much debate over this when journaling disabled/enabled was brought into play. The journaling enabled version I feel is alot more stable simply because you can have those occasional fc's or battery pulls that would normally cause data corruption if severe enough on no journaling versions. My personal experiences now using journaling enabled for a few weeks is excellent, during testing I had lockups requiring a battery pull and even used the old soft reset (VOL UP+CAMERA+POWER) which would be a ultimate NO NO, on no journaling resulting in data corruption but on journaling enabled it doesn't seem to hurt anything.
Its all a matter of preference which you like to run, but lately it seems much demand has come for the journaling enabled version so that is what I currently have running very successfully so that is what will be released in the coming day(s). I'm having an issue with app installations causing boot loops to happen on the no journaling version so until that is resolved I will not even consider releasing it.