Omega boutiques generally are limited in their discounts, x% everywhere. But they have far better service and it is worth it in the long run.
For example, omega starhill said that they can give me a ton of freebies together with the watch purchase:
omega ballpoint pen, omega leather calf-skin card holder, omega travelling bag, etc
They even agreed to change my omega box to the wooden lacquer omega box, normally only reserved for solid gold models, at no extra charge.
They will also give you free buffet vouchers every year on your birthday, etc.