GOT for me
Avengers is likely to end in a very traditional ending, with some losses but for the most part a return to normal. I'm curious how it ends, but I don't anticipate something that really surprises me. The MCU is consistent. It's lead to lots of well made films, but I don't go into any of them expecting any major curveballs. That limits what you can really expect out of this film. Because the franchise is expected to continue it's also not going to give you an definitive end. It's just another chapter, albeit with likelihood of the death of major characters.
GOT can go and lot of different ways. Some potentially very disappointing. However, if the ending is truly what GRRM has laid out to the showrunners, it does havr the potential to really surprise. As there's no talk of a spinoff set beyond the current timeline, it's going to hopefully allow for a definitive end point, and a fundamental change to the world it takes place in.