I'm inclined to vote against both of them.
In my dearest fantasy, some day someone I can vote for will be on the ballot.
As long as we vote against the much, much worse candidate, the other party will have zero incentive to put anyone worthy on the ticket.
If you are happy voting for the one who smells of sulfur just to keep the one who reeks of sulphur out, more power to you.
Some day you'll be able to hold your head high and proudly proclaim "I voted for slow destruction!"
In 2005, Governor Romney forced Catholic hospitals to provide abortions and day after pills in spite of their moral objection. Would he do the same as President? I cannot say. Can you?