Well, based on my insane loathing of loading times, I'd vote go slim.
Other than that, the difference between them is slim is a bit brighter and seems more fragile. If you can however, tolerate very long loading times (Comparitively) then go for the old version, seeing as buying it + 3 games (presumably ones you want) for 110 will be cheaper than the 240 it would cost for an equivalent light.
See Ya George.
"He did not die - He passed Away"
At least following a comedians own jokes makes his death easier.







