@Gainer :-
Heh. O-kayyy.....
There's a few choices. One worth looking at is the suggestion by
@The Duck , above. EasyOS is the brainchild of the ex-PuppyMaster himself - Barry Kauler - the genius behind the original Puppy wayyyy back in 2002/3. Barry stepped-down from full-time control of Puppy the year before I joined the community in 2014; he handed-over development of Puppy to the community itself, along with the Puppy build-scripts (called Woof) that would let you feed a mainstream distro in at one end, and it would spit out a Puppy based on that distro at the other end. Henceforth, these were re-named to Woof-CE (Community Edition).
BK wanted to devote more time to his own projects (of which there were plenty in the pipeline. The man has a very fertile mind!)
EasyOS is 'container'-based - think Docker, if you like - and lets you run not only sandboxed applications/browsers, but even entire other OSs if desired. It's like a Puppy version of a VM, in a way.
The Duck's link will take you to Easy's own home page.
~~~~~~~~~~~~~~~~~~~~~
Another one worth investigating is the 'Kennel Linux' series, many of which are based on Void Linux, and exemplified by the original KLV 'Airedale'. It uses the XFCE desktop environment, and this is the brainchild of the Puppy Forum's webmaster,
rockedge.....initiated by the development of another series of easy-to-use build scripts from another of our senior members,
wiak.
These can be found here:-
https://klv-airedale.rockedge.org/
~~~~~~~~~~~~~~~
As for me, heh; I'm not a very good advert for the community, I'm sorry to say. Most OS adherents will insist that you should always, always, ALWAYS use the very newest, most up-to-date version of any OS (for safety, security, privacy.....you know the drill, I'm sure).
Although I usually have an install of whatever the current flagship Puppy of the time happens to be, somewhere on the system, it's rare that I actually run these as a 'daily driver'. I happen to really LIKE some of the older Puppies, and am happy to run these.....because I've long since figured out how to keep all the important bits up-to-date. Newer kernels, updated glibc, updated SSL stuff, updated ca-certs, etc, etc. All the critical stuff.
For quite some time I've been running Tahrpup64 on my main rig, which dates from 2014! I have something of a soft spot for Tahrpup, since it was the first Puppy I ever tried that literally worked OOTB on my ancient 2002 Dell Inspiron I had at that time. It 'turned me on' to Puppy in a BIG way; so much so, that within weeks I'd gone all-Puppy on every machine I had in the house. I haven't looked back since.
Needless to say, MY version of this Puppy is as secure as all the others.
~~~~~~~~~~~~~~~~~~
I would recommend you take a look at the current flagship Puppy, BookwormPup64. This is based on Debian 12 'Bookworm' of course, and is one of the most polished Puppies yet. Roger Grider, it's sole developer, has outdone himself this time.....and Puppy is now starting to finally use the Synaptic package manager (which I detest, but I'm not getting into that).
BookwormPup64 at the Puppy Forums
That's the BWP64 sub-forum at the Puppy forums, where you'll find the download link for the latest release, 10.0.8.
Do understand ONE thing. All Puppies tend to be the work of single individuals, using the WoofCE build-scripts at Github, then further tailored/customized/tweaked to fit the individual's 'vision' of what a Puppy should be. There's no dev teams here, because with the build-scripts there's no need.
Puppies LOOK like they're from the turn of the century; they don't have a swoosh, streamlined, ultra-smart desktop, but that's because the work is all unseen, under the hood.....to make them as easy-to-use as possible. Like any Linux OS, the customization potential is endless. Just don't dismiss them out of hand, based solely on appearance...
Mike.