Here is a great compare/contrast of two of the strongest-polling candidates. It’s Nate Silver, so you know the facts and analysis are solid.
http://fivethirtyeight.com/features/stop-comparing-donald-trump-and-bernie-sanders/
Here are Nate’s bullet points, but be sure and read the entire article.
1. Trump is “winning” (for now), and Sanders isn’t.
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2. Sanders is campaigning on substantive policy positions, and Trump is largely campaigning on the force of his personality.
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3. Sanders is a career politician; Trump isn’t.
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4. Trump is getting considerably more media attention.
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5. Sanders has a much better “ground game.”
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6. Sanders holds policy positions of a typical liberal Democrat; Trump’s are all over the place.
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7. Sanders’s support divides fairly clearly along ideological and demographic lines; Trump’s doesn’t.
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8. Sanders’s candidacy has clear historical precedents; they’re less obvious for Trump.
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9. Trump is running against a field of 16 candidates; Sanders is running against one overwhelming front-runner.
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10. Trump is a much greater threat to his party establishment.