Welcome to BLF. 
Yes,It will not give us concrete evidence that the VTC5 is more durable, However, others with more hi tech equipment have done tests and I believe the VTC5 is well proven.
As I said I had one other LGHG2 about 2 years ago,before I had my Opus. I noticed after about 9 or 10 months that it was degrading. Just by my run times and the voltage checks before, after and while resting a few days.
So I have had a total of 2 X LGHG2. Both have shown relatively early degradation compared to my VTC5[That is the main reason for this test] and so far with my VTC6,Two of which are almost as old as the LGHG2!
I get a lot of use out of my lights and batteries. I walk my Husky 7.5 miles a day. At night[my favorite hike] I have at least 3 lights with me.
So far CAPO and have have hiked over 15,500 miles in his 6 years of life.