Which is the healthier option between the two? Sugar-free or fat-free?

The problem with fat-free stuff if that they often replace the fat they remove with sugar, so there's that.

I had a nutritionist tell me to choose low fat or low sugar but never pick fat free or sugar free. She said those end up being less healthy than the original stuff they're trying to improve.

Out of the two, I think fat-free is the healthier option because usually when sugar-free is thrown out there on a product sugar substitutes like Aspartame become the sweetener.

Sugar-free is healthier. Processed and added sugar is actually toxic to the body. And, the problem with fat-free is, a lot of processed sugar is added to make up for the lack of texture and taste.

The key, of course, is moderation. If you eat 1 fat-free cookie or one scoop of ice-cream (with sugar), you'll be fine. But, most people's psychology is that since it's fat-free (or sugar-free), I can (and will) eat the entire box of cookies in one sitting without ever getting off the couch as they applaud themselves for "eating healthy."

In my humble opinion,neither.
We believe, it is healthier to eat real foods in smaller quantities.

Both are better for you but you have to check the amounts of sugars, sodium, carbs, cholesterol, and saturated fat before purchasing. All of these cannot be totally avoided but you need to choose what has the lowest possible amounts (and sometimes that means switching to an off-brand or just a different brand). It really all comes down to reduction in intake...and the larger the reduction the better.

That can be a tricky question to answer. When they remove something, whether it’s fat or sugar, it’s replace with something...and that something is usually nasty and harmful to our health. In the last few months I’ve tried to stay away from sugar substitutes...I believe it’s poison for our body.

Hmmm..that's a hard one. Sugar free with no sugar substitute would be best. Fat isn't as bad as people make it out to be. Sugar is basically poison but sugar substitutes are bad too.

sugar free, to make fat free taste good they just put in more sugar

Honestly, you are better off eating food the way nature made it. Just eat less.

Fats are necessary in order to use fat-soluble vitamins.

sugar-free but Idk I don't eat either.

Fat free

Sugar free. We now know and it is clear sugar is the enemy, not fats.
Fats are pretty harmless and are actually important nutrients. Even saturated ones.