Congratulations on your decision to go solar!
In your grid-tie setup, as others have already mentioned, there should be no noticeable difference in electricity quality simply because you’re just feeding the AC grid with what you produce on the rooftop.
Where electrical quality comes into play is when you start messing with batteries and inverters - and specifically, inverters.
Most inverters fall into one of two categories (though I’m sure there’s an exception out there somewhere):
Modified Sine Wave
and
Pure Sine Wave
Modified sine wave inverters are the less expensive of the two and are generally used for most electrical needs. They do their best to mimic the AC wave that the grid AC provides. It’s a bit choppy, and the waveform looks more like a staircase than a smooth up and down. Most stuff runs off this just fine, but it’s choppiness can introduce noise in more sensitive electronics, and some super-sensitive electronics may refuse to operate on it altogether. (My Apple AA battery charger refuses to function on my MSW inverter.)
The Pure Sine Wave inverter is essentially exactly what it sounds like - it faithfully mimics the sine wave AC from the grid. They’re a bit more expensive at the moment, but prices are coming down as their popularity goes up. These inverters generally do not introduce any noise into the electricity they produce, and electronics and motors work much more comfortably with them.
I’ve found having one of each is the perfect compromise - a larger MSW to operate ‘the house’, and a smaller PSW to operate the electronics. If I had bought just one PSW large enough to operate the entire house and all electronics, I’d have spent 2 or three times what the compromise cost. And that resulted in having left over $ for other more important things like a larger battery and an extra solar panel. In my case, totally worth it.