I think Natty and Frosty nailed most things, but I would add that most fish tolerate snails, while many will see shrimp as tasty, expensive treats.
If you do go the snail route, remember the quote from above "Good luck buddy!" Once a snail tank, always a snail tank. 
Dave
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5 Gallon hex – 2 Otos and jillions of MTS…hoping to make it a CRS tank
15 Gallon (my son’s aquarium) – Platies, Cories, and the Gupster
15 Gallon Trainwreck – Danios, Cherry Barbs, and a Dwarf Gourami
55 Gallon semi-South American biotope – Now cycled!
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