While I might agree for a max Plat Plate, at your rank saviour res is better than iron, since dissolvers are rare, and doing the maths it equates to more hp than an iron plate.
Back tot he original post, if you wish to run any energy dependent weapons at all, I recommend MPV, since with EFA you have to equip one energy module at least if you want to run those, without any energy dependent weapons efa is better since it allows for better modules and more weapons. Overall, I recommend playing a sorrow, and otherwise I recommend using Windigo since it is now very very strong and easy to get. Right now you can't really go wrong with any of those torsos so it's up to you.