There is information out there - but unlike with local and general elections, there is no historical precedent upon which to base your views. In the short term, the choice is often being defaulted to which political party you might support - and that should not be the reason why you vote for a PCC.
Their role is ill-defined. What they are designed to replace is ill-defined. Their own plans for what they wish to achieve are reduced to vague soundbite platitudes.And, at least for my own constituency, the candidates are equally unappealing.
At the moment it seems to be and expensive waste of time. :)
A couple of links that may be useful;
Background information and detail on the role of a PCC
http://www.homeoffice...-crime-commissioners/
Your local candidates by postcode;
http://www.policeelections.com/