A guilty pleasure of mine is time loops, as a concept. I think they're a wonderful, fantastic plot device that is horrific and horribly traumatizing to those in one (see In Stars and Time and Groundhog Day [at least if I'm remembering that movie correctly]). They can end being something horribly traumatizing, but also beautiful and hopeful (see Slay the Princess and also ISAT again).
Anyways, I'm not here to talk about why I like time loops so much, but more what format I think they're best in. Obviously, any sort of story is a time loop, in a way, but I am referring to the plot device, not stories being circular from reexperiecing them again.
In my opinion (opinion warning), videos games are the best format for a time loop story to take place in because of the gameplay loop. Inherently, games tend to have the same sort of mechanics over and over again. In Pokémon, you can use one of your six pokémon on your team and you can choose from four moves to attack another pokémon. In Rain World, you are trying to get to the next shelter before the cycle is up, and you have to avoid various enemies and find food.
The mechanical gameplay loop is why I think time loops work best in video games. You're already doing the same thing over and over again, normally just with different objectives, like bosses you need to beat or crops you have to harvest tomorrow to make enough money for a house upgrade. Now you're seeing the same dialogue, same scenes, and you have to use the loops to complete objectives that may take multiple loops to set up.
Slay the Princess starts with "You're on a path, in the woods" everytime. I skip it a lot of the time. In Stars and Time starts jumping loops, so at one moment, you're at loop 79, the next at 83, even though you did not do four additional loops.
Video games are just able to add that extra layer of monotony, of memory slippage that would genuinely happen if you were constantly looping everytime you died. (A proper, finished STP run means you loop somewhere around 15 times, could be more or less depending on whether you get to each vessels' Chapter 3... and some other factors. ISAT normally takes a significant amount of loops in order to finish the game.) Video games have a wonderful way of adding that layer of horror of you forgetting or getting angry seeing the same things over and over again, at seeing the same lines you used to laugh at. Movies can also get it across, but again, they don't have that gameplay loop that just adds the cherry on top.
Any timeloop media is a treat to see, so obviously I'm not policing anyone, but it's my personal opinion. I'd like to start making my own time loop visual novel at some point!