Should be aluminum rims if they're original. But the stem is not and that saddle looks wrecked. Sitting outside in the snow = beat. Realize that these bikes almost certainly need a complete overhaul (bearings greased, cables, housing, possibly tires, etc.) But for $40 it's worthwhile if you do the work yourself. You could probably re-sell the Marco for $10-20. I wouldn't put any money into it.
Schwinn looks to be about a 54cm frame, how tall are you? It could be worth about $150 in good ready-to-ride condition.