JR EAST 103 Series
In Japan, trains used to carry more people than designed. The designs are all the same. The color is changed to make the route easier to understand. JR EAST is still divided by color, but I think the design has become fashionable. I think Kansai is more fashionable now. For a long time, Kansai trains were old. UNIVERSAL STUDIO JAPAN also put a USJ color sticker on the old design.
People who used to ride a lot at that time probably like the trains released by KATO now. I like Hankyu trains. The design is a little different, but it's about the same color.