Kowloon or Hong Kong Island? which is best?

I'm going through Hong Kong on my way back to the UK but only for 2 days (unfortunately!). Wondering if it's best to get a hotel on Hong Kong Island or Kowloon. I just want to do a bit of shopping, go up the lookout on the tram (train?), markets etc. Is the public transport good enough that it doesn't matter where you stay or should I definitively go for HK Island or Kowloon? thanks for any advice! :o)