Ok that makes more sense. Your original post said you get incredible fps gains (unless I misinterpreted), which is only true when DLSS is running in performance, balanced or quality mode - because then it renders at a lower resolution and upscales it to native resolution. That’s why small text looks so blurry. Whereas DLAA always renders @ native res.
For most people DLAA & TAA should be roughly the same performance and which you prefer will come down to personal preference.