Just having a poll on this. Vote only if you really follow both series, I mean if you try to see most races, follow the news, and try to know what's going on in both series.
Last year when F1 was still an equal favorite series alongside IndyCar for me, I probably followed F1 more closely. That was just because I had done it most of my life and it was more or less of an habit, IndyCar has less media coverage, and I wasn't as aware of the options there are to follow IndyCar. That was the case even when I'd started to prefer IndyCar.
But nowadays I'm even struggling to to follow F1 the way I defined it above. I watch races if I have time for it, don't religiously look for news but check them if I see something interesting. Just enough to have some idea on what's going on. But definitely less than IndyCar. It's more like following F1 was, trying to watch all sessions and watch full replays of missed races. And checking news daily, or rather multiple times daily.