I don't believe there are huge differences between the two main parties policy wise. Their manifestos don't really tell you much of substance, and as the next government is going to be in coalition anyway, the parties can jettison any part of the manifesto during 'negotiations' should they wish. Besides, who knows what sort of decisions will have to be made over the course of the next parliament? Personally, I think it's more important to come to a view on the parties general 'orientation' towards issues. This at least provides some very general clues as to how a parties future decisions are likely to align with your own preferences. For me, in very general terms, the Tories are about a small state, individualism, trickle down economics. Labour are more about stronger state services, collectivism, some redistribution of wealth. The latter proposition is for me much more convincing, but others will have their own view (or may entirely disagree with my characterisations of the main two parties).