When it comes to attending a friend's engagement, your outfit choice should reflect your personal style and comfort level. While both the plain silk Saree with embroidery and Westernized options can be great choices, you may want to consider some factors before deciding on an outfit.
Firstly, think about the dress code for the event. If it is a traditional or formal affair, then the plain silk Saree with embroidery would be appropriate. However, if it is more casual or modern in nature, then something more Westernized may fit better.
Consider also your own personal style and comfort level. Are you someone who loves wearing traditional clothing like Sarees? If so, then go ahead and wear the plain silk Saree with embroidery! It will make you feel confident and beautiful on this special occasion.