Would you prefer colorization of B&W films if done well?

Absolutely not. There's a reason B&W films invariably look peculiar when colorized, even in a good colorization process. Everything visual in the film, from lighting to makeup, was crafted specifically around the particular needs of filming in black and white. The techniques used differed fundamentally from those used for filming in color and it's impossible to mask those differences through colorization; the finished product will pretty much always read as essentially visually wrong.