The products are different:
Coral-Vite is a vitamin and mineral supplient (calcium, iodine, iron, magnesium, potassium, strontium, etc). With regular water changes I don't see much reason to use this unless your tank has very high demands.
Coral-Accel is called a "growth stimulator," but if you read the label its really more like "food" I guess. Protein, fat, fiber, etc. It's 99.8000% water. You can risk overfeeding and fouling your water if you use too much of this product. Depending on what type of corals you have, and what their nutritional requirements are, you may or may not choose to use this product.