At which I guess I'll point at
Sourcegaming's early data, where Custom Robo seemed to be four times as big as Takamaru. (0.5% versus 2.3%)
I used to think Takamaru was really popular in Japan, but I've seen very little evidence of that. If anything, he seems to be much more popular
here. At any rate, I end up feeling like it's silly to compare which Famicom rep that no one but nerds remember is more deserving on popular grounds, because them being in at all is in defiance of decisions based on the grounds of popularity.