Hi Shank,
In my opinion the LTV one is always better, you get a better rate because you have more equity in your house so you are less of a risk to the bank.
Check some of the other banks mortgage rates, or somewhere you can compare them and you will see that the LTV's are always lower that the standard variable. The better your LTV the better rate you get.
I'm only a homeowner like yourself but I've never seen an LTV of (> 50% & < 80%) be higher than the standard rate.
Regards,
MB05