Help in picking shoes

Recently I bought two pairs of shoes, Hoka Mach 6 and Challenger 6. The Challenger I bought to have for military training (crawling/running on sand, being wet..) because alot of people recommend them. I bought the Mach 6 for overall running so if the Challenger are wet I could use them instead for normal running ( also for speed work), which shoe should I use for easy runs? Mach 6 is a little bit more cushioned but the Challenger is more stable.