Guild Wars 2

I was wondering if anyone has figured out/tested whether different merchants of the same kind all sell the same things for the same prices or if this varies? for example, all armor merchants would be selling a specific dagger for 200s, once you’re at that level or slightly below? or do they have different prices but at least the same selection or does the selection vary as well?

Thanks!

I believe NPC vendors all have the same item at the same price. And you get the same amount selling items to any of them. No better deal selling armor to the armor NPC than the weapon NPC, etc.