I just discovered this thread and I have to agree with @Hypolite Petovan I like Diaspora as well. I like its very clean interface. Hubzilla and Redmatrix never got my attention since Friendica is doing everything that I want.
I like GNU Social as well (I do have an old Statusnet server and a GNU Social server on my system - both with several users) and I like the way that Mastodon is looking.
I don't feel any hate for any project you mentioned. My goal is to interconnect them all just because I dislike borders. Because of this goal I'm willingly to interact with any developer of the other networks to reach that goal.
Given the large influx of new users into the fediverse, you may be unaware of the tradition that we all vehemently hate each other and refuse to work with each other because the other guy is a twat.
If you use Hubzilla, you hate Diaspora, Ostatus, and RedMatrix.
If you use RedMatrix, you hate Hubzilla.
If you use Diaspora, you hate Friendica, Hubzilla, and RedMatrix.
If you use Friendica, you hate Diaspora.
If you use ostatus, you hate everyone else who uses ostatus.
This is the law of the fediverse, please bear this in mind. When picking fights with random strangers, make sure it's always based on nothing other than their software choices.
This has been a public service announcement on behalf of the fediverse. Thank you, and good day.
Diaspora: Clunky XML behemoth with some degree of privacy, a fuck tonne of metadata that has to be stored even by complete strangers.
DFRN: Clunky as fuck XML behemouth, but damn well works, with pretty good privacy, but by God, it makes your head spin.
Zot: On paper, the best of the lot, light weight, nomadic, more powerful and simpler than the others...but nobody understands permissions, so it's pointless.
Ostatus: Shouting at people anonymously.
ActivityPub: Privacy, as imagined by somebody with no actual experience of implementing privacy, reimplementing mistakes made by everyone else nearly a decade ago.