 If you liked
Tate no Yuusha no Nariagari
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 ...then you might like
Infinite Dendrogram
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What these two stories have in common that both stories have the creepy crazy mad scientist that does experiment on large tanks trope that have evil schemes to destroy the world. also no stories are complete without the epic battles to save the day.
Although there are also its other difference wont go into details.
the other similarity is for shield hero as default equipment on the get-go is a shield... Infinite Dendrogram they get a companion, for our mc happens to be a cute girl that turn into a weapon but they can be anything even a big castle.