This question poses a conflict between two philosophies, but is not meant to necessarily compare their strengths. Only if Love of Neighbor is indeed the antithesis of the libertarian philosophy.
Libertarianism as I understand it (from reading lots and lots of Robert Heinlein Sci Fi) is the idea that laws should be crafted so that personal liberties are always acknowledged. So long as you don't hurt anyone else, whatever you do is OK. Drugs, Sex etc... are legally OK, but it's not advocated in any way leaving a person in a state to excercise their freewill and follow God in their own way. The other side of it is TANSTAAFL (Their ain't no such thing as a free lunch) which is pretty bibilical (If they will not work, neither shall they eat) in the end of 2 Thessalonians).
Personalism as I understand it (from listening to lots and lots of Catholic radio and reading John Paul II's Love and Responsibility) says that,
A person is an entity towards which the only reasonable attitude is love, as an extrapolation of the 2nd greatest commandment and the Golden Rule. Therefore, if you consider yourself a person, then you ought treat others as you want to be treated and you shouldn't do things to yourself that you wouldn't do to others.
So, as far as I can see it, it is pretty difficult to reconcile the two ethics. Is there some depth into libertarianism that a Christian can delve, and then they need to pull up and get a breath of fresh air, or should it just be totally avoided?