I just switched to Fios a couple of weeks ago, so I have no info on SU game availability.
I can say that the quality of the picture is vastly better. Haven't seen any of the pixelation issues that I dealt with on a regular basis when I had TW. There are a ton more channels offered in HD, the Internet connection is vastly quicker and the price is, at least for now, significantly lower for significantly more content.
The only negative I will note so far is that the Mets games that WPIX carries (25 in 2015) are, as far as I can tell, not picked up by Fios like they were by TW. Most of the games I will miss will be watchable from other stations however (NESN, Yes, TBS, etc.).
My understanding is that all the regular season games TW televises for football and basketball will be made available on Fios but not exhibition games and not the other Olympics sports. Not sure if the coaches show will be shown on Fios...