Maybe a third option? I bought the North Face Ventrix jacket and its somewhere in between the Arcteryx and MEC in price (on sale for 40% right now too for $173 CAD) and its definitely on the same level of quality as the Atom. Some cool features are that it has vents for breathability when moving, but completely seal when not. Also, if worried about durability, the Ventrix has panels on the arm with a tougher material that will not rip if using it actively when climbing/bushwhacking, etc. Highly recommend this, and do not get the MEC one, it does not last.