i read full frame is better quality over all for whatever your shooting. somewhere i read its 2 stops better in lower light as an example and the bodies are more robust.
"Better" depends on what you're comparing, but there's a point at which noticeably "better" and "worth the difference" intersect. If you're not specifically looking for a characteristic of a FF body for what you're shooting now, then you're nowhere near that intersection.
Low light performance depends heavily on the sensor itself and the well depth of each pixel. In general, FF sensors have larger sensels which gather more photons and therefore generate more electrons producing better signal. My FF camera has worse low light capability than many APS-C bodies simply because (a) it has very small sensels and (b) it's a half a generation or so back.
I have no idea what you condsider "robust," but since there are more professional and "prosumer" FF bodies than amateur ones and they cost significantly more, I'd expect their characteristics to be "better."
Let's say you spend 1x for an APS-C body and 2x for a FF body and you expect your APS-C body to have to last 5 years. That means that FF body needs to last 10 years to have the same value proposition all other things being equal. If you need a particular feature that FF or a professional body provides, then all things aren't equal. But I submit that if you needed that, you'd know it- if you don't know it, then you don't need it and you'll be better off spending that money on better quality lenses, which will last you at least 10 years. You'll get way, way better results with an $800 modern DSLR and $2700 in two lenses than a $2700 DSLR with two ~$400 lenses. Plus, in two years when a new $800 body comes out that outperforms today's body, it'll be easier to upgrade.
Paul