My personal favorite is Tamiya's yellow tape. The stuff is very thin which minimizes thick paint edges. It cuts beautifully without leaving and fibers or fuzz to mar a sharp line. It is very strong which is useful if cutting a long, thin strip. It is fairly flexible to mold to surfaces with compound curves. It is tacky enough to stick well without being so tacky as to pull off paint.
3M Blue tape is fairly good and quite inexpensive compared to Tamiya tape. It is a touch thicker than Tamiya tape, and not quite as strong or flexible as Tamiya tape, although it has the good cutting and low tack properties of Tamiya tape.
Depending on the masking situation, if I need the super fine edge or strength of Tamiy tape. I'll use that otherwise, I'll use the cheaper 3M tape.