For a true test, I would shoot the two film, same format on the same subject. But it looks like you have 2 shots done one 2 different formats. The shot on the bottom looks like a contrasty scene while it's under exposed and over developed. Correct me if I'm wrong. Also, T-max film has a clearer film base than Arista. I've used Arista Ultra EDU in 35mm and 120. My only complaint is that the film base is too curly. But they've fixed the problem.