I think the vaulted ceiling works to your advantage, and the fixture itself has a light, airy feel. It's a beautiful chandy.

Both the high ceiling and the light open fixture mean you can go to the larger side. I think the chance to view it in person will help you make sure it doesn't seem to be too much or too heavy, but it doesn't look like it should. I'm assuming it is round, but it also looks like it could be oval, in which case you would hang the width with the length of your table and you probably wouldn't have any question about size.

I never thought about turning it, great advice lascatx thanks

Because our our vaulted ceilings I was able to go a bit bigger with my light fixture without it looking too weird.