The convection is nothing but a regular oven in which you can bake cakes, make biscuits, etc being added to the Microwave. This is the type which you should buy if your needs are more than heating and making maggi.
I am using IFB oven since last 3 month. No problem till date. 3O Litre capacity is sufficient for a family.
We are using microwave to make tandoori chicken and fish fry( with no oil) . I think its better to use microwave to make oil less chicken and fish fry. We also prepare cake, biscuits and pizza.We dont have additional cylinder at our home, so whenever we run out of gas we use microwave for daily cooking needs.hope this helps.let me know if you need any other information