Film SLR VS digital SLR, who can better practice the photographer's skill?

I don't know what kind of skills you are talking about, but you can learn more from playing with film than playing with numbers. I suggest you play black and white first, and you can build your own darkroom if economic conditions permit. This will definitely give you a deeper understanding of photography, which is better than playing with numbers at first, and you can buy a digital SLR later if necessary. However, this process of playing with film will never be redundant.