Waterproof trousers for ultra - minimus or atomic?

Debra Bourne

Montane waterproof pants - Minimus vs. Atomic. I already have the Atomic and they were great during the horrible weather on SDW50 in 2013. I'm trying to decide if the smaller size, lower weight, ? greater breathability justifies buying a pair of the Minimus. Anyone used both and can give me a comparison?