ARE-1, stands for Application for Removal of Excisable Goods form No. 1.
if you havn't availed the CENVAT credit on inputs intended for trading under export to another country, even then, it is better to export under ARE-1, for the purpose of submission of proof of export and availed the benefits associated with exports.
Further, removal of goods as such and trading are two different activity though it may overlap each other. But if you are manufacturer and avail the CENVAT credit on the inputs intended for export then it may beneficial to you as there is no duty on export (except in few cases).