I'm a huge fan of 1:1 except when it serves a specific purpose. I also like my IC time to line up with RL time, because I get a lot of inspiration -- I can be decorating my house for Christmas and wonder how my characters might handle Christmas onboard a giant airship aircraft carrier while also worrying about whether fascists are sending dragons after them for the giant spell they cast on their last mission.
There are definitely times for different time scales -- I think we used 2RL:1IC pretty effectively on The 100 for the first part of the game, because we wanted events to happen close together ICly, but we wanted time to play out the repercussions. And either a time skip or switching to 1RL:2IC or even faster for short periods of time to advance plot can be very effective -- as @Coin said, mostly on small games. That's because, of course, Staff has to either trust everyone to come up with what their character did during the time skip or faster time, or they have to vet everyone's plans.
That said, I still think that 1:1 is the best for games set in our world in a recognizable time, because it helps keep everyone's vision of what's happening in the world in the same place. On a game with a different time scale, it can be jarring to realize that you missed a holiday or that one's coming up very soon, to say nothing of birthdays or other character-important dates.