I think its a great topic to consider because for the first time ever, the Ps are competing neck-to-neck with similar models launched around 2 weeks from each other.
I think the Savvy's the better design (and will handle far better), but what will seal the deal is the fit and feel of the entire car. For example, the Gen 2 looks great on paper, but the interior just feels so nasty. The door handles are an absolute disgrace. What's the point of trying to make it look upmarket when the first part of the car which the driver touches is so discouraging? Why does Proton have to be compelled to change things just for the sake of it (like Waja signal stalks, yeah, the window switches are cool looking but don't work well)
I doubt the Savvy's fit and feel is going to match, let alone, exceed the Mvvi's. There are of course deficiencies (which I will elaborate more under the myvi thread), but none at this point which indicates that it is inadequate as a long-term proposition. Remember also that by purchasing a Proton, you will be buying into a service culture where the best (and often only) explanation that Proton techs give is, "They're all like that".
All of these are may not be serious considerations to petrolheads but to the majority of Malaysian motorists (including aspiring ones),which one's going to give them better value for their hard earned in the long term will be the deciding factor.
I wish the Savvy all the greatest success, but my prediction is that its going to get the *&$t kicked out of it by the Myvi. Hopefully, there'll be more transparency and speed with the registration figures in the future.