Well, assuming you’re just considering the SS models, the new ones are only jubilee bracelet, so if you want an oyster bracelet you need to go old batman. The Pepsi has more history and is rarer than the Batman, but again you’re not buying a watch because of how rare it is (I hope not). The Pepsi also has more ‘copies’ (other brands with same colour scheme).
So the easy question is just do you love Red/Blue or Blue/Black?