What is the difference between CRSC and CRDP? Which is the best option for a disabled veteran to use?

I may be smoking crack but here is my 2 cents. If a veteran has 20 years in and has a VA disability he can get money from the military and the VA. If the veteran has less than 20 years he will get only money from the military or the VA, but not both. CRDP

If the Veteran gets injured while in combat the veteran gets retirement from both the military and VA regardless of the years served. (CRSC)

MAJ Armando LLamas: You cannot receive both CRDP and CRSC at the same time. If you get $1.00 of CRDP, you can't get CRSC and vice versa.
CRDP requires at least a VA disability rating of 50% or higher and twenty years of military service. If you have a VA waiver on your military retirement, and the VA disability rating is 50% or higher, then you automatically receive CRDP to compensate for the VA disability rating. Your VA disability rating encompasses all disabling conditions which were received in service, whether related to combat or not, as well as employability.
CRSC is based on actual injuries received from combat. It does not require twenty years of military service. However, it may end up providing you a lower disability rating than a VA disability rating. This is due to the fact that not all disabling conditions received in the military are considered for CRSC. CRSC does not look at issues of employability.
You can apply for CRSC even if you receive CRDP. If you are awarded CRSC, DFAS will do a review to determine which will provide a greater benefit/pay out. If you are awarded CRSC, then you will receive information each year, usually mid to late November, regarding the open enrollment period in December, so you can determine which you wish to receive (CRDP or CRSC). This is due to the fact that your CRSC or VA ratings change.
You need to discuss this with a Veteran Service Officer or an attorney who specializes in Veteran's Benefits. Once you have the discussion, then you will be better informed as to which direction you want to go.

I suggest consulting a Veterans advocacy organization such as AmVets. AmVets helped me with my disability claim, and my representative has always been very knowledgeable and helpful with all of my questions.