All of them use systemd since years. Thus stability is high for each of them. To find out run all of them. You may install Tumbleweed with btrfs first. Shrinking the filesystem while mounted is done immediately. Thus multi boot operation is virtually hassle free.
**erlangen:~ #** btrfs filesystem resize -10G /
Resize device id 1 (/dev/nvme0n1p3) from 51.69GiB to 41.69GiB
Manjaro (with KDE) was my main system for about 4 1/2 years and I found it generally reliable. But it seemed to be getting less so and requiring more manual interventions with each update. I can’t say how reliable it is now as I switched to openSUSE TW last September. I’ve found TW more stable; no problems at all. I may be wrong, but I think many of Manjaro’s problems stem from it being downstream from Arch, but with modifications.
I’ve also been running Arch since last year as my fallback system in the event of an openSUSE catastrophe. Fortunately, I have not had to use it as such. Consequently, it doesn’t get much use at all, but I keep it updated (many updates) and so far no problems. So, about the same as TW.
As this is not a real technical openSUSE question, it is moved to General Chitchat.
How stable is TW vs Manjaro or Arch?
I know of no technical specifications on how to measure this. And when there is, I know of no organistation (person) that, on a regular base, does make up a list according to such a standard. Thus I guess your question can only be answered by people having used those distribution(s) for some time and having some “feelings” about their stability. Typical a Chitchat conversation ;).
I’m not sure the discussion is comprehensive, but it might give you some things to think about. Plus you could add new questions to the old thread (which might wake up the people who had an interest in that topic).
I was for many, many years an Arch-user (about 15 years) and I switched about two years ago to OpenSUSE as my main OS.
I could not say which one, Tumbleweed or Arch, is the most stable one but I I notice is: Arch comes faster with software updates/upgrades and Arch is/was a bit more demanding (or: you have to pay more attention when you upgrade something). I would not say one is better but if you do not have so much time to “follow” your system, I would go for Tumbleweed and, if the time invested in the maintenance of your system is not an item for you, then I would go for Arch.
in October/November last year, there was a problem with the nvidia driver after a kernel upgrade. Arch was ways faster to solve this problem (= to offer new updated packages which resolve the problem).
in the past, with Arch, after nearly each cups update, I had had to configure my printer again, else I, nor the other users on my laptop, could not use print. I never encountered this problem with Tumbleweed.
And now, to answer completely, some words about Manjaro: I never used it as my main OS and do not have such an experience with but I would say this: when you install it, you get right away a configured system (very useful when you need a graphical environment) but you must be very careful by each update. So, in comparison to Arch: less time invested in the first configuration of the OS but afterwards more time needed to maintain it.
The openSUSE/SUSE platform has multiple releases in support, so it does take time to investigate, back port, test and deploy. You will also find that embargoes are in place and as indicated above until the embargo is lifted folks are at work and ready to release.