In the first drgons book Ky'el seems so different than giants. He's more human and the giants are so different and giants speak a different language. Ky'el understands giant speak but it may not be because they are related but because he is so smart.
Titans are strong and intelligent, but it didn't seem giants were so intelligent. Titans definitely have an advantage over everyone else except maybe the eagle lords and dragons. Don't think anyone can top the dragons of ruin mist.