Help me pick a system for my campaign(s)

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Consider this a general thread for discussing the merits of different systems, although it's actually just a request for help from a dm who hasn't dm'ed in years.

I'm going to be running a couple campaigns next year based on settings and ideas I enjoy and I'd like to find which systems fit best.

The one campaign is slightly inspired by valkyria chronicles, a sort of 1st world war story set in an alternate world with slightly different technology, creatures and such. I'm thinking of using the Only War rules, as I don't really know any other system that emulates trench warfare.

The other campaign is inspired by banner saga. It'll be a dark fantasy story where the players are villagers that get uprooted from their homes and have to protect their neighbors and family as the refugees make their way through hostile territory. I may set this in the warhammer fantasy setting and have the players be uprooted by a chaos invasion and try to make their way to the safety of the empire. I want a system where violence matters and the pc's feel like normal people. I contemplated Zweihander, but the system seems a little underdeveloped last I played it. WF 2nd is a good fit, but it's so fucking ancient. Are there any other good systems for low power medieval games?