I've played both and I am not really sure which one is better in my opinion. Both are really good games, Storm the House has like Dicken said many features, bonuses and upgrades while Warfare 1917 has good graphics, two sides to choose from and takes more strategy to win. I agree with dush, the last levels in Warfare 1917 are hard but, since I enjoy Warfare 1917 more I'd rather go with that game.
I don't know why, but i suck at warfare 1917. same with storm the house 3. but i am slightly better, so, my vote is Storm the House 3. (although i like neither of the games)