Actually, that's why, in the opening post of this thread, I wrote "What do you think?" and not "Which are the best Ladies jumpers?", since this is a discussion, and we can't pretend to be right in everything we say: it's just our perspective!
I agree. My work involves a lot of statistical analysis and modeling, so I like to be precise, especially when you try to draw conclusions.
Whenever make summary or judgment without stating 'it's my personal preference', you have to provide evidence, use statistics to support your ideas, and show correlation to the conclusions you make. That's what I will call good argument.