Eating twenty grams of fat does not expose you to the ill effects of glycation, and reactive oxygen species that burning carbs provides, or if you're getting it from fruit higher in fructose, remember that that fructose is 10x worse a glycator than glucose.
If you're getting it from fruit, it's not too terrible a hit on your liver, if you're getting it from sugar, since there's little fiber, it gets absorbed quickly and your liver has to dispose of the fructose half in the sugar rapidly.
Not to mention the insulin spikes if you go over the threshold.
In terms of neoglucogenesis, it's less efficient, which means that some of the protein is wasted in the process.
You're better off with the fat, if all you're worried about are the fat vs carbs macros.
Now, if you're doing a PWO, carb refeed, and that's what you're after, you can't eat fat instead as fat gets turned into triglycerides or ketones, so if you've depleted your muscle/liver glycogen, the only thing you can do is to eat carbs, or have your body produce them by catabolizing muscle, if not enough protein is being digested.