Hear hear!Velvet has smaller spots and they're far more numerous. It also advances much, much faster. A fish covered in velvet will be fully infested fast. Often in very severe cases looking dusty. Fish with velvet tend to be more cryptic, hide from light, swim in to powerheads, discolor towards the end with gill damage, and die quickly. This is the most dangerous/deadly parasite in the hobby.
Ich is a larger white spot, far fewer. A fish is almost never "covered" in ich. It's still very deadly but much slower moving taking months sometimes to reach critical mass.
With both a fish will breathe heavily. Velvet is every bit as common as ich now.
Many mistake the two, some say they had a really bad ich infestation but in reality it was velvet. That was me for years. Now I can see the difference and I know the behaviors and progression.