This is how I rank tutorials based on their style
1. Tutorials with comic illustrations
I love those. The comics set a friendly and funny tone to the text, so they are easy to read. In some cases, just pleasurable to read. Land of Lisp and Head First into Design Patterns fall in this category.
2. Small, to the point
They introduce enough of the topic to make the subject accessible without taking too much time. They leave you with a quick sense of accomplishment and break the trepidation on starting with new technology. http://www.nodebeginner.org falls and Getting started with Arduino.
3. The book tutorial
These are book-length tutorials that delve deeper into a topic. Here we are either learning a lot about a topic or we are learning a lot of techniques connected to the technology. Sometimes they can work as a reference. MVC Nerddining tutorial, Ruby on Rails Tutorial, and Real World Haskell belong to this category.
So, for efficiency reasons, number two is the best. Number 1 are the most fun, and number 3 can be the most useful, but they require more investment from the reader.