Before, I use Active for my subscriptions, and Top Day or Top Week for the All feed. Currently, I use Scaled for my subscriptions and All feed unchanged (Top Day or Top Week). I just like how I can take a peek at All and looking at the day's or week's top posts while mostly keeping to my subscriptions.
I sometimes look at Top 12 hours or Top 1 hour in my All feed, but rarely.
I either select "All" or "Local" on occasion and don't really pay attention to how those categories are filtered. The main challenge I see right now is that there is a lot of content not available or translated in English which leads me to blocking communities that otherwise have interesting and valuable discussion.
Plus there are challenges with figuring out how to find stuff that is new and insightful besides the regular defaults on the feed but perhaps part of that is simply because of not posting enough and being part of the experience.
Once you block the painful, overly political communities, the million ten girl manga porn communities, and the relentless trans subs, you get a pretty good feed when subscribing by new for all. Just have to bite the bullet, and cull what's not right for you personally.
I start with Subscribed/Active to get my fix for the content I want to see, and then Subscribed/New to contribute comments that aren't parroting what others have already said.