The plastic trash can that is made today is perfect for bathroom with touchless faucets and automatic soap dispensers. This is the cheapest and easiest trash can to use for cleanliness. Plastic that is placed over stainless steel makes it even more robust while still being easy to clean.
Outdoor trash bins with flaps are better at keeping the waste contained, even controlling smells to a certain degree. However, these receptacles are also more prone to getting broken or needing to be cleaned, since the flap comes into constant contact with the waste.