Hi Charlie - Both can be used, but for image transfers, Type 79 has a decidedly yellowish cast. You also need to wait longer before pulling the negative apart than you would for 59; let the dyes set up about 30 seconds before pulling. I have found that the yellow cast is actually pleasing, as it definitely sets the image apart from the usual 59/669 look. You can always add some cyan filtration if you want to reduce the cast.
Handle your transfer gently in the wash/rinse stage, or it can literally rinse away.
Here is an example (from a Kodak EIR negative). The little greenish swish in there is my fault, agitating the rinse a bit too aggressively - but it gives you an idea of the tone.