Who's going to pay for the repair of the inevitable chipped edges, you, your decorator, or your fabricator?

If designers had their way, cars would have square tires to look cool.

Square is more modern, but nothing else in your bathroom is modern so go for the more traditional (and durable) rounded edge

I would use the ogee edge and a rectangle sink.

Square edges are chip factories, especially at sinks. From the guy who fixes them for a living. If it's better to look mahvelous than to feel mahvelous, go for it; guys like me need the work.