"Better" is subjective and depends on your uses and riding style. Does your riding style and personal preference favor disc brakes, or electric shifting?

Specialized makes a Roubaix model with both disc brakes and the Ultagra di2. It's not what you're looking for, but it shows that they do have at least one model with both of those features. As [MENTION=27981]Wanderer[/MENTION] suggested, you could wait for "the one" that has it all... we can't predict Specialized's product roadmap, but if there's a Roubaix with both of those features this year, maybe there will be a Sirrus with them next year. No guarantees on the cost, though... (the Roubaix with both costs something over $6000.)