I have not used both , however I have used smelly jelly for about the past year.
My buddy bought the pro 4 oz crawfish glitter that is STRONG. On more than one occasion we have used it side by side with the exact same baits that did not have it and it has seemed to outdo baits with out.
There are many times where we have been casting around the boat and the bite goes dead for perch, and you can dip your bait in the smelly jelly and we are so confident that the next time in the water you get a bite and that is usually what happens!
I just ordered a small jar of alewife and panfish feast to try this ice season to see if it helps.