Picasso's artistic pen has been used before. Although Picasso's brand is French, its manufacturer is in Shanghai, so it is strictly a domestic pen brand. If it is the primary practice of hard pen calligraphy, Picasso's artistic pen is a better choice, even if the pen tip is wrong or broken, it will not be a pity.
Good things should be put in the back! Personally, I think it is better than Picasso's artistic pen, and Duke's artistic pen is more suitable for practicing hard pen calligraphy. It is no exaggeration to say that Duke's pen should be the most cost-effective, among which ruby and d2 are famous. Ruby is better than d2 in design and practicality. Of course, the price is a little expensive, so if you want to stick to it for a long time and have a certain appreciation of pens, you might as well choose ruby.
Having a good hand can greatly increase others' impression of themselves. Hard-pen calligraphy is really something worth exercising and persisting in. If you want to do a good job, you must sharpen your tools first. A good pen can make us stronger. However, it should also be noted that the pen is a tool after all. Only by long-term persistence can we have satisfactory returns.