People who compare this to attack on titan (and even think attack on titan is better) have shit taste.
Anyway, Isai no Hime is a compelling manga about a queen in a strained position whose country comes under attack. She is torn as both a ruler and a citizen of her country, and wants to protect it and find out the reasons it has come under attack. Also there's some real cute giants and monster fights. It leans on the ecchi side but sometimes that's the price we pay when everything else about a manga is really good. The character interactions are delightful and cute most of the time, and the dramatic parts of the series are deliciously tense.
Stravaganza - Isai no Hime