any bands you like more than COB

that is so easy.

Cob is an unique excellent band, but there are bands way superior to children:

Blind Guardian, Rhapsody, Tuatha de Dannan, Iced Earth.
 
Symphony X, that's my favourite band and I'm quite sure, that there won't be another band, which has the same effect on me, ever!
 
To mention some of them:
…and Oceans, Abigor, Ancient, Arcana, Arckanum, Autumn Tears, Burzum, Corona Borealis, Dargaard, Dark Sanctuary, Die verbannten Kinder Eva’s, Dominion III, Elend, Emperor, Empyrium, Enslaved, Forseti, Grabesmond, Hrossharsgrani, Ice Ages, Immortal, Jääportit, Mortiis, Orplid, Pazuzu, Penitent, Pilori, Satyricon, Soil Bleeds Black, Summoning, Tenhi, The Sins Of Thy Beloved, Unto Ashes, Vond, WeltenBrand...