Don't worry about hijacking haha, it's nice to have study chats with people of similar levels! (putting my reply here just to save some space, not to be secretive or anything)
I’m liking KMG as much as one can like a grammar learning book I chose it because it was pretty highly rated and I liked the lesson layout, but it is a bit dry. I used them the last time I tried to take the N3 (and crashed and burned due to stress), but now that I’m using them properly as a study aide things are going well. I didn’t look too hard at Tobira but I seem to remember something about their comparative formats (it’s been a long time, can’t quite remember the specifics) that didn’t resonate with me. It is definitely more of a textbook layout, and you have to do a lot of the legwork yourself with extra practice, but it fits with what I need it to be! If you’re curious as to what it looks like, here’s one of the section entries I posted for when I was asking a grammar question.
I’m relatively lucky as I can do a chunk of my studying at work (I have no classes at all on Tuesday, and most of the time prep for the rest of the week takes two hours tops), so it’s not too much of a problem with time as I’m prioritizing Japanese study over other things. I did have a crash when I worked from home, but that wasn’t really due to anything except mainly my laziness. It is essential to space it out, though - KMG is deceptive in that it looks like it’s not teaching a lot, but you really should be spending at least a few days on each grammar unit, even if there’s only three new points.
I’m so very behind on the bookclub I don’t think I’ll catch up before everyone else finishes but I might copy your strategy and wait until there’s a vocab sheet, assuming I get far enough that it becomes an issue. I’ve found having Japanese subtitles on anime helps the most for me to remember vocab more than straight reading as I’m more of a visual+auditory learner, so this might be the only traditional-style bookclub I join, but I might lurk a bit on some other ones in the future
If you’re working with Tobira right now or you do later on, lemme know how it goes - I’m curious as to how it works for someone at a similar level as me!