If the titan wakes up and slaps Earth then we’re done. If not and the dragons are just normal creatures without titan juice giving them a boost then Earth could win. It wouldn’t be as one sided as people think because of magic use, warlocks, etc but Earth would pull out ahead and have a good bloody nose for it to boot especially if they use mana bombs and things.
Don’t forget they can salvage our technology and adapt with it. Especially the gnomes and goblins. Since a lot of Earth tech was once military tech in origin they could make good use of it and make some nice leaps ahead…hic!