Knitting Help - Three Options for Joining a New Ball of Yarn

Spit splicing, Russian join, tying knots - what is the best option for joining a new ball of yarn for your project? In this video, we talk about the differences, and when it's best to use each one.

If you missed the annotated links in the video to the different methods of joining, here they are:
Spit splicing: http://youtu.be/8uLiFOVmcUU
Russian join: http://youtu.be/qWrh8VmTJug
Changing colors for stripes: http://youtu.be/MZKNuDQNlmM

The sweater on the mannequin is my Woman's Zippered Letterman's Jacket, pattern + video tutorial:
http://verypink.com/2011/09/07/womans-zippered-lettermans-jacket/

The pattern for the sweater I'm wearing can be found here (not my design):
http://www.ravelry.com/patterns/library/sitcom-chic

The yarn I used in the demonstration pieces is Knit Picks Wool of the Andes Bulky.

The nail polish I'm wearing is Julep color "Flora":
http://refer.julep.com/s/stacip