They both have their merit, like many people have said, but i have a real soft spot for the 1/48's, just don't us them in battroid mode. My 1/48 Super Max (Miriya will be on the way soon!) looks amazing in the gerwalk and figher modes but battroid....just doesn't "feel" right. If i wanted something in battroid i'd definately look at a 1/60 as they really do look a lot more cohesive than the 1/48's.
Now all i have to do is buy a better display case with more room to fit in miriya