Your favorite brand is Nike. What makes Nike so appealing to you? 
Ever since I was young I liked their football trainers the best! I still prefer the style of their trainers.
By football you mean soccer? And by trainers you mean running shoes? And by "young" you mean something I haven't been for a while? LOL 
Haha, I do mean soccer! The only real football in the world! I mean both trainers and running shoes. Casual and athletic styles.
Groovy. Nike is involved in every sport, I expect. What famous player in the UK is sponsored by Nike?
I think Virgin Van Dijk from Liverpool is sponsored by them. I'm sure there are hundreds of others as well.
Is Nike the biggest brand there? Adidas must be pretty big too. They make pretty good footwear. 
Nike and Adidas are definitely the biggest two brands. Then there's others like Puma  and New Balance.
At my age, you look for bargains. When I was younger, I liked both Adidas and Nike. Now, I get them if they're on sale. 
These days I try to look for value for money too. Unlike my younger self who just had to have the newest shinny football boots!