I've heard good things about ADA aquasoil as well. However I've also heard that a lot of things will work and in the end there isn't much of a difference between them. The ada stuff has more nutrients built in which makes start up a bit easier, but over the course of a year or more its going to have all been used up. With the water column fertilizers (which you will need anyway) and root tabs (which you can go longer without with some soil types but will need them after a while) the soil doesn't make a long term difference.
What I would look at as more important is what type of fish you want to keep and what colors are available and what color you want. Some fish prefer sand, some prefer a bit larger gravel, etc. And I think the aquasoil comes in a dark brown and a tan, so if you want a different final look you might find something else that fits that look better.