Well... I think that if our dreams became true, we would be in real trouble, ivalice is danm full of monsters and war, crystal chronicles series has the miasma and sickness that can hit at any time, the medieval worlds have terribly powerful monsters and the modern/cyber/steampunk have monstruous machines and mass destruction weapons... not mentioning the hell that would be Type 0 series lol
I guess Cocoon and pulse are the prettiest and ivalice would give the most exciting adventures, but I feel that having magic in one hand and technology in the other is the best, my vote goes to Eos from Final Fantasy XV