Measuring the Quality of backlinks

Having put hundreds of hours creating my website (still working on
it). I have now gone into phase two where I am linking it to relevant
content through every platform I can find.

When I look at my competitors, I find that some have a higher keyword
ranking than others, with less backlinks, even though as a website
they have the same PR and are roughly the same size.

I can only put this down to the quality of backlink, which I keep
hearing people refer to. So my question is: How can I measure the
quality of backlink that I am getting from various sources?

www.crisptshirtprinting.co.uk

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