Best travel guidebooks

Bookstores shelves are piled with guidebooks for all tastes and pocket sizes. Although the increasing use of mobile travel guides, paper books are still the preferred choice to guide on a city tour. Here is a small overview of the five leading travel guidebooks available (1-very negative to 5-very positive):

Lonely Planet (4.5)
Popularity: 5
Quality of the content: 5
Content detail level: 4
Languages available: 5
Price: 2

Rough Guides (4.5)
Popularity: 4.5
Quality of the content: 5
Content detail level: 4
Languages available: 3
Price: 4

DK (4)
Popularity: 4
Quality of the content: 4
Content detail level: 3
Languages available: 5
Price: 3

Marco Polo (4)
Popularity: 3.5
Quality of the content: 4
Content detail level: 4
Languages available: 4
Price: 3

Michelin guides (4)
Popularity: 4
Quality of the content: 4
Content detail level: 3
Languages available: 4
Price: 2