Spinach is a better alternative on sandwiches and burgers than lettuce.

Lettuce has almost no nutritional value, it is very bland and sometimes has an off putting smell. Spinach has more nutritional value, has a nicer, more tender texture and overall a healthier vegetable than lettuce. Spinach is also a more classy vegetable than lettuce. Lettuce lacks the iron, calcium, and antioxidants that spinach has. Also spinach has a longer shelf life than lettuce, lettuce tends to get stale and soggy pretty fast.