I owned or tested a couple of the speakers you mentioned. And my personal findings are…unfortunately, it’s the room and your taste (in what you want to hear from a speaker), that decide what will work for you. If you have any chance of getting test pairs for all of them, try them in your room, only then you will know for sure and not keep that ‘what if’ nagging in the back of your head!
For example, I’ve had the Kii for a couple of years and really liked them. My two main problems: I couldn’t get them loud enough in our large room (clients on the couch in the back wouldn’t feel it). In my smaller room (about 25-30m2) that was okay. The second problem were the low mids & the higher low-end. I do mostly acoustic music, drums, bass, guitars, vocals…often lots of low-mids that I need to hear clearly. As great as they are, I always had trouble hearing it they way > I < wanted to hear that area, with lots of low-mids. That’s why I initially said ‘taste in what you want to hear’. For electronic music or rap, that wasn’t as much of an issue, especially if you work with already great sounding VSTi and samples. The solution to both problems may have been the extenders, also to get more low-end out but since they cost crazy money, the Kii went and the ATC came in.
After hearing ATC50s at a friend’s mastering studio, I got active 20s with a JL sub and they work great in my small room. However, as with most ATCs, without a sub, the 20s sound slim (and didn’t work in that large room either). A couple of years ago, I’ve had a chance to test 25s (not the new ones) against the 20s and, in my smaller room, I even prefer those a tad for the low mids, also without the sub. In the large room, it still would have needed a sub but I preferred them over the Kii for sure. The newer 25s are probably even nicer but that’s just a guess. In the end, I didn’t sell the 20s in exchange for the 25s though. They work and, to sell them, raise more money, exchange speakers and get used to them…too much hassle for a very small improvement in that room.
A friend had 25s too and owns the Kii and he sold the 25s but kept the Kii. It’s taste and what you want to hear…
Over the years, I’ve tested about a dozen speakers in my rooms, also new Genelecs, Dynaudio, Amphions, Events, Munroe, NS10s, Auratones etc (we also have Geithain, Quested here in the larger rooms), and by chance, when I wasn’t even looking for speakers, I got to test a pair of Neumann KH150 in my smaller room. They may not look inspiring and might be even expensive for what they are but, in that room, without a sub, they are the only pair I would need (especially with the mic/room treatment).
I don’t recommend that you check them out but, to bring it back to the beginning of this essay, you have to try the speakers you’re interested in, in order to really know what you can get from them in your room. And who knows, maybe an odd-ball will work best for you. Good luck testing!