I created a Relative Value Index to directly compare these two.
TVIX low was $109 on June 5th with an RVI of 3... an order of magnitude drop from the TVIX peak.
Since then the RVI has doubled to 6 and should continue uptrend into July.
RVI peaked at 7 today ((201/3047)*100) but settled at 6 ((169/3041)*100).
Currently still great relative value, better than any point before last week.
I reupped TVIX another 10% today as it stayed mostly under my $205 Buy cutoff.