The Leadville Is definitely lighter than the Alchemy + I would presume also much lighter than the BC Shift based on its weight/reviews. I personally love my Leadville - so much so that when I lost it, i bought another. That being said it not a stand alone piece in cold weather without activity (more of a transition seasons 40-65). Its windproof against most any reasonable speed, but its not insulated much, which makes it great for packing size/weight wise. The material is reasonably durable (no wear after a year of constant use + frequent washing), but not at burly as most arcteryx, BC, + slightly less than Alchemy. Water resistant at best, but not a sponge either. Highly breathable, but still has cloth pockets which makes it seem slightly warmer w/o sacrificing much breathability + never clammy after a workout. The fit is athletic, slightly more trim than the Alchemy. For running, my suggestion would be the Leadville.

I can't comment on the other 2, but having used the Leadville a ton, I can say it offers a great combination of breathablity and weather protection. The windstopper front and back keep the weather out, while the breathable side panels do a great job dumping heat and moisture when you're working hard. I also like how stretchy and lightweight it is. Not the warmest soft shell out there, but it works great for aerobic uses as well as layering.