When one puts aside all the histrionics, all the melodrama, all the irrelevant secondary bullshit such as appearance, charisma, ability to tele-evangelize, all the irrelevant policies such as what planet the US should colonize or how women should procreate, and focuses on just one thing: which presidential candidate (not to mention president) will do the right thing for America, which is to make sure that it doesn't collapse under a record debt load, there is just one answer. And it is not even ours: it comes from the impartial Committee for a Responsible Federal Budget Project, aka US Budget Watch ("U.S. Budget Watch neither supports nor opposes any candidate for office. Its reports are intended to promote understanding and discussion of the federal budget and how specific policy proposals would affect the deficit") which today released an analysis on debt sustainability titled "The GOP Candidates and the National Debt." The answer is in the chart below.
That's it. That's all that matters. The rest is noise.
Full report below (pdf)