Enfamil or similac?

Si

I tried breast feeding and unfourntatnely that didn't work out. So now I'm stuck with bottle feeding....I've been feeding my baby similac. However, I've noticed it doesnt make him feel full... he wants a bottle every 30- mins to an hour. Is this normal? I feel like he's not getting full enough off Similac.

Has anyone tried both formulas and found that Enfamil is better?

Thanks!