The better choice between an electric steamer and a microwave oven largely depends on the specific cooking needs and preferences. In general, an electric steamer is superior for preserving the nutritional value and texture of vegetables and fish, while a microwave oven offers convenience and speed for a variety of foods.

Electric steamers are ideal for cooking delicate foods like vegetables and fish because they use steam to cook. Steam cooking is a healthier method as it retains more nutrients compared to boiling or frying. According to a study published in the Journal of Food Science, steaming can preserve up to 90% of the nutrients in vegetables, whereas boiling can reduce nutrient content by up to 50%. Additionally, steaming maintains the natural texture and flavor of the food, making it a preferred method for many health-conscious consumers.

On the other hand, microwave ovens are more versatile and efficient for cooking a wide range of foods. They can heat and cook food quickly, which is particularly beneficial for busy individuals or those looking to save time. A study by the Journal of the American Dietetic Association found that microwave cooking can reduce cooking time by up to 80% compared to conventional ovens. This efficiency also translates to energy savings, as microwaves use less energy than traditional ovens.

However, it's important to note that microwave ovens can cause some nutrients to degrade, especially in vegetables. A study published in the Journal of Agricultural and Food Chemistry found that microwaving can reduce the vitamin C content in vegetables by up to 30%. This is due to the high temperatures and the lack of moisture, which can lead to nutrient loss.

In conclusion, an electric steamer is better for preserving the nutritional value and texture of delicate foods, while a microwave oven offers convenience and speed for a broader range of cooking tasks. The choice between the two will ultimately depend on individual preferences and cooking requirements.