The common list contains aluminum foil, plastic cling wrap, waxed paper, sandwich baggies, re-sealable sandwich baggies, and of course, Tupperware containers. Guess which option is my favourite. These really are the best option, as they are less prone to leaking than foil and cling wrap, and are reused, reusable and recyclable to boot. Now, dealing with the lesser options, I would have to prefer foil above saran, as foil is also recyclable, provided it isn't encrusted with melted cheese or something similar. Depending on where you are, lightly waxed paper will biodegrade in a municipal composter, so that can be an eco-option as well.
Trees are also a renewable resource when well-managed, so there's minimal guilt there.
The bagging option offers up some interesting twists. You can try washing and reusing them, but the plastic is rather weak. These are very durable and the perfect size for sandwiches, half used onions, tomatoes, cheese, etc. So try to avoid the disposables, even if they seem recyclable, and go for your preferred reuse option whenever possible. The environment and your leftovers will thank you.