The speaker is in total control of the wording which has been decided and learned beforehand. Also, the speaker can plan for,or fit into, and exact timing. Lastly, the speaker can use non verbal language quite amply with this mode of delivery since he/she will have no paper to hold or handle.
The disadvantages are that time is required for memorisation, and there is a risk of forgetting part of the speech during the delivery. Secondly, the speech can sound memorised and lack of spontaneity, reducing the speaker's effectiveness. Thirdly, since the speech is totally prepared in advance and memorised, the speaker cannot respond to the audience/feedback.
The disadvantages are that time is required for memorisation, and there is a risk of forgetting part of the speech during the delivery. Secondly, the speech can sound memorised and lack of spontaneity, reducing the speaker's effectiveness. Thirdly, since the speech is totally prepared in advance and memorised, the speaker cannot respond to the audience/feedback.