I would say Fandango at Home (formerly VUDU) and iTunes (Apple TV+) are must-haves. Sometimes one service has a deal on a title that the other does not have. Sometimes one service upgrades HD titles to 4K while the other may not. Fandango at Home (formerly VUDU) had the 4K version of Once Upon...
Every now and then I come across a Blu-ray in my collection with a code I forgot to redeem. So far, they have all worked, even if there was an expiration date. There was one I tried to redeem (Tinker, Tailor, Soldier, Spy) via the studio. It would not redeem on their website, but I was able to...
John, I started with digital copies when I kept getting a "free digital copy" included with Blu-rays I had bought. Once you download the needed apps (Apple TV +, Fandango at Home, Movies Anywhere, etc.), you should probably go through your disc collection and see if you still have the inserts...