London vs. Warsaw

A good friend of mine (who also happens to be a great tour guide, and also a fan of mustaches) has the opportunity to move to either London or Warsaw for work. This poor guy has moved to NYC, San Jose and San Francisco for his job. I really pity him.

Anyhow, I will be visiting him in either city (oh yeah Tristan, by the way...) so I need some insight on which city he should choose! He has promised to select the city that is chosen by my readers, so you have a great opportunity in front of you! To help you decide, I've gathered some tidbits about both places.

London:

• London is the most densely populated area in Britain and is the ninth largest city in the world
• The London Eye or Millennium Wheel of the city is the tallest Ferris wheel in Europe (I will def be visiting this)
• There are more than 100 theaters in London. Moreover, about sixteen percent of the country’s restaurants and food joints are located in London (I love theatre! And I love to eat!)
• The London Underground, built in 1863, and popularly called ‘Tube’, is the first metro of the world (umm, I will obviously be all over this one. You know I love my public transportation!)

Warsaw:

• In 2007, Warsaw was ranked as being the 67th world’s most expensive city to live in and was ranked as a minor world city (def cheaper than London)
• I am Polish. I think. (my dad always calls me a stubborn pollock?)
• The Warsaw Ghetto was the largest of the ghettos in Nazi-occupied Europe, located in the territory of General Government in occupied Poland during World War II (this would be fascinating history location to visit, and there is a lot of history in this area regarding this)
  

Hmm....there weren't too many interesting facts about Poland, BUT, it might be a better choice given its less expensive. Anyone out there been to either?

Votes and recommendations are welcome!