You can't beat a cantilevered umbrella for style or flexibity. There's no center pole to get in your way. Place it behind a sofa group, to the side of a long table, next to a spa in a pool . . . instant shade. The umbrella tilts in any direction, rotates 360° around its cantilevered pole, and can be taken down in seconds in case of strong winds.
Expect cantilevered umbrellas to be in the high price range.