I avoid flatpaks, so I don't mind.
eugenia
Linux Mint, because I don't like to tinker with the system, I like good defaults (and Mints has them).
Yeah, I don't understand flatness either. Neither I understand the dark themes either. My eyes and brain simply can't do the separation easily, I spend more time trying to process an image. Old style icons and UI colors are the best IMHO.
I've tried several distros to fit on my repurposed Chromebooks that came with 16 GB emmc storage. Debian was the smallest one, using by default about 5.5 GB of data, plus 1 GB for swap, plus the boot partition. I had about 9 GB left after installing, with XFCE. After I installed a few apps and games, I ended up with 6 GB free space. It works fine and it updates fine.
I don't like flatpaks. Some builds don't support printing, for example. Same for snaps. That's why I always prefer appimage from these types of binaries, but my favorite always remains the repo versions.
Gimp 3 is scheduled to be released in May, around the time that Debian 13 is about to come out. Given that Gimp is never on time, and that Debian will only include stable software in their repo, you won't see Gimp 3.x on Debian for another 2.5 years (the next major release).
However, don't fret. There's a way to run Gimp 3, even now, without overwriting the 2.10.x version of Gimp that comes with Debian: https://github.com/ivan-hc/GIMP-appimage/releases That's how I run gimp 3 on my Debian too, I just download the .appimage file, make it executable, and it's up and running.
I'd say Linux Mint is your best bet. It's easy to use and it works well. Update it after you install it, and then install a new menu applet for it, Cinnamenu (from the applets dialog). It's much nicer than the default imho.
You are making a mistake. You are comparing an Android or iOS tablet, that have a user interface that makes sense for these devices, and you're trying to shoehorn Linux in them, and expect the same "fine enough". It won't be, because while it might work, it won't be ideal. Linux was optimized to be used as a desktop OS, with a mouse or touchpad. You'd have to install something like LineageOS to get it working properly, but then you will lose the cool abilities of a linux desktop for the most part. Conclusion: get a tablet if you want, but don't throw away your laptop.
Edit: Also, this was posted just an hour ago https://www.youtube.com/watch?v=H669Fwtv-3o
Can't wait, it's becoming really usable (I always needed adjustment layers, and it now mostly has them). I wish they offered an appimage though, I'm not big on flatpaks due to size.
Actually, I'd trust the Graphene guys' evaluation. They do know what they're talking about there. And it's true that Playstore is more secure than foss store offerings, unfortunately. You see, these are built securely. Google is a security-driven company. That much is true, and I know that first hand. BUT they are not a PRIVACY-driven company. There is a difference here.
What we need, is a totally de-googled Chromium with added hardened extensions (e.g. bringing back the v2 manifest to run various privacy and security extensions). This would have more security than Firefox, but also more privacy.
I believe that's the best way forward, because creating a new web browser from scratch with these performance expectations, is a pipe dream (looking at you, ladybird). So, yeah, the open source community needs to fork chromium, not firefox. Firefox was never great to begin with as a technology, it's measurably slower than Chrome for example, and it uses a LOT more RAM. Linux users are known to want to resurrect old computers with less than 4 GB of ram (I'm one of them), firefox can't deliver that. I always have to resort to Chrome to make it bearable. But I rather use an official foss fork instead. One that is trusted.
Everyone is replying as if the OP is asking about normal live environments, but I think he's asking about having Linux actually fully installed on a usb instead of the ssd. In that case, most of the replies don't apply. However, Mint has a way to install itself properly on a usb drive. Boot with the burned iso, insert a second usb drive, unmount it, and then install on it (you choose it during installation). It has to be unmounted first.
Enough packages show up.