The "problem" for Republicans is that at least 1 and possibly up to 3 supreme court seats are opening up within the 4 years. Presidents come and go, congressional majorities ebb and flow, but if the Democrats get to seat 3 new justices then they might lose the Supreme Court for a generation, and the Republicans care a lot about the supreme court. So the question is not who will be the better president, but who will select the the 'better' supreme court candidates.