Thanks for trusting Ayurveda and seeking help on authentic platform. Ayurveda shares different Guna by different procedures  it's effects on body is also different. Just not New dhanya isn't good for consume It's must be sun dried and stored for at least a yr to nullify it's kled bahulyam. When u make flour or just boil it shows different Guna In same way u may note some Guna difference in Roti n chilla as it's water content n roasting is different. I.e. chilla is good for pitta n Vata pradhan prakriti n doshik vyadhis but Rotis good for Vataj n kafaj prakriti n doshik vyadhis

Diet is as per constitution. Consult on app personally

You can eat both, just see for oil , don't use too much oil and on a daily basis I won't recommend you to have something with oil, because it's kind of fried food when you make chila.

No it is ok to use one millet and time in roti or chilla. You can either make roti or chilla. Just consider your digestive system. If chila is not causing bloating it is fine

You can make millet chila as well. It's absolutely fine. As you mentioned go for a single millet at a time.

Millets are good

Artificial are not good as natural one.

U can opt any , millets are healthier

Take proper knowledge N we will suggest you diet menu