I found that pos daftar and pos laju rate is quite similar in most of the cases. Unless you have super heavy or bulky stuff then pos daftar is the only choice. If you are sending something light and small domestically, I recommend pos laju, it's much faster and reliable.

For oversea, the pos laju or EMS is extremely expensive so most of the time use pos daftar, unless shipping high value item then use EMS.