For me, the LOOB seems to define the curls and actually gives them some texture and sometimes (if it is humid) it will help clump them.
The SMU gel holds the curl very nicely. I have tried using SMU alone and it just doesn't give me the curls that I want. It does create some curl, but no where near the amount that the combo of LOOB and SMU does.
I always scrunch each section 8 times to help create the curl too (as per someone posting that method on the board about a month ago).