Hi System user,
You can use either tape or glue on both the poly and the lace. Many people like to use tape on the back and sides and glue on the front hairline. The reason is that the tape is thicker than glue and, depending on your hairstyle, the glue is more undetectable. Tape is fine for the back and sides since those areas as covered by hair. The most popular tape is 'Walker No Shine' because of it's no shine qualities and also because it's strong and easy to clean up. It doesn't break down and get 'gooey.' Base Bond and I Glue are used often since they're acrylic and easy to work with and also easy to clean up. Everybody's body chemistry is different and glues and tapes can work differently for people but this is a good place to start.
Regards,
John