The "gaited horse saddle" is a marketing strategy, not an "operational design concept." This does not mean they are bad, only that they are not necessarily good.
I ride a Stubben Scout, my wife a Stubben Siegfried VSD-DL. They work quite well on all our horses they fit.
First, determine the discipline(s) you will ride in. Then pick the "shape" of the saddle. Then find one that fits you and
Human fit is every bit as important as equine fit. If the saddle does not fit the human then they will not be able to gain a secure seat and this will mean they will be unbalanced and that will unbalance the horse.
Finding the right saddle may mean one trip to a shop and it may mean an odyssey.
Good luck in your search.