Are there any good reasons to set up a "US LLC filing as a?
Don't get confused with the difference between entity formation and taxation of that entity. The formation of entities is done at a state level and the choices are many. The taxation of an entity is done through declaration to the IRS, which removes any confusion between the intent of ambiguous entities, such as LLCs. You actually won't be able to set up a US anything. You have to pick a state to set up the entity, and for this, you really should get some help from your advisor. It sounds like you are from outside of the US.