New Oven in the US, Which would home cooks prefer?

I am an English girl living in New York and looking to re-do my kitchen. The most common oven in the US appears to be 30" single space with a warming drawer underneath. In the UK it is a 24" double oven. Questions 1) Does anyone use the warming drawer for anything other than storage (esp in the city environment)? 2) If you had a choice would you prefer 30" single space or 24" double space? Thanks for any help given, want to ensure I design not only for myself but also future tenants given it's a rental :)