Romney
Actually, the three prongs of conservatism, are all intimately connected.
Economic conservatism is as important as social conservatism because your economic independence is what allows you to keep your conservative social values.
When you have a economically interventionist government that stretch its fingers into every aspect of your life, you have little choice but to adopt the values that whomever is in control of the government.
Why do you think the inner cities is 95% democratic. It’s because they suck at the teat of government entitlements and hence they have no choice but to support those who keep those programs going, and hence adopt all their social values in order to do so. Jesse Jackson was at one point pro-life in the 70s.
Preserving our economic freedom and reducing government regulations is essential to conservative values. Reagan had conservative social values, but the most important thing he did domestically was to reduce taxes and getting rid of regulations such as the Fairness Doctrine. Which allowed free enterprise to blossom, and in turn helped grassroots values conservatives to find a voice away from the MSM.
Strong National Defense, Free Market Economics, and Traditional Moral Values, they either survive together, or die apart. They are all important, the best candidate is the one who has the best combination of all three, not one who is simply great on one but awful on the others.
You left that off of your list.