Also watched this comparison first thing when it came out, but was bit disappointed that they didn't test things that would really stress the memory - like seeing where's the limit when apps stop staying "live" in the background, or where's the threshold when Safari tabs start to reload.Finally, a good YouTube review on both the 8 GB memory and the 16 GB memory. Bottom line do not waste your money on the 16 GB.
That being said, I wonder why Lightroom wouldn't be faster on 16GB vs 8GB iPad. Could it be that Adobe hasn't applied for app developer entitlement to use max memory for their iPad app?
Btw. is there any memory monitoring apps for iPad to see how much individual apps are using RAM? I guess there isn't?