Tony's is available in a SALT FREE form. This is the only Tony's that I use, but the stuff is great because you can use the desired amount without your food becoming too salty.
I haven't had the other mixtures so I can't compare, but the Salt free Tony's blows doors off the regular stuff.
I use texjoy for my land animals and tony's and slap ya mama for seafood. IMO the best thing to use to really give it a kick is sprinkle A LITTLE texjoy crab boil powder on stuff. Its powerful, but goood.