If you have one formal and one casual dining space, you can really go to town with different chair designs for both. A casual spot will do best with sociable, comfy seating that naturally leads to conversation, whereas a formal setting is where you can play around with luxury fabrics. If you only have one dining room, you're going to need to combine all of these elements in one set of chairs, if possible!
But in the end, another crucial factor comes into play: personal taste. After evaluating all pros and cons of each table, you will have to take into account your home’s style and which table it is that you prefer. After all, when you’ve found the perfect table for your dining room, regardless of its shape, you’ll just know!