padiscubapro:the main difference is that the SDI solo diver program is a recreational rating and has the course content and equipment requirements of such, the ANDI program is a technical diver program, and requires all the gear, knowledge and skills of a tech program...
aside from teaching the person on Solo Diving, the resort managers still needs to be informed of such, as most resorts are very hesitant to let a diver go solo.... maybe it has something to do with having to pay a local guide....... here i am guessing.....
but i do solo dive where i may be permitted.