Two lights are better, but if you use thee pendants, then position the two stools should be in the middle of the center and end lights.Although they will look very huge. Pictures would help.

I think it depends on the style and atmosphere you want to create in the room. If the room is a formal, traditional one like your picture, then one large showy pendant would look great. However if it is a modern or contemporary room then two ( or more) smaller pendants would be a nice feature. It would also pay to think about how much light you are expecting from the fitting, especially since it is a cathedral ceiling. Do you need the ceiling lights for good general lighting or just for atmosphere. Do you have any photos of your room so we can see a bit more?

My partner and I are designing our new build and we are now up to lighting, in particular kitchen lighting. We are having non-exposed scissor trusses in the living area with a lowered flat ceiling (2.4m stud) over the kitchen. Do we need pendant lighting? I am torn. I feel they are dust and grease gatherers, but also a great visual feature. I have attached a picture of our plan and inspiration for the living area. I am extremely grateful for any advice!

Changing out my pendant lights dramatically changed my kitchen for the better. The slim modern horizontal shapes made the room feel wider and the colour changed the colour of the wood grain finish of the cabinets.