Nah Linux Mint is a Kia Ceed.
Ubuntu is a Ford Focus, they successfully stole the volvo estate market (Debian). The car was fun, good value and very practical. It was everywhere. Then Ford started increasing the size, weight, price, etc… killing the point of the Focus.
So along comes Kia trying to make a competitor in the Ceed.
In theory the Ceed is a great car, its super cheap, lots of cabin space, nippy, the inside has every modern convenance, but…
Your left wondering why anyone is bothering with hot hatchbacks these days as you climb into your volvo
Debian would be a Volvo Estate, its the boring practical family choice, the owner is soneone boring like an architect or a financial advisor.
Arch is a Vauxhall Nova, second hand battered owned almost exclusively by teenage lads who spend a lot of time/money modifying it (e.g. lowering so it can’t go over speed bumps, adding a massive exhaust to sound good but destroys engine power).
Fedora is something slightly larger/more expensive like a Ford Focus/VW Golf/Vauxhall Astra owned by slightly older lads. The owners spend their time adding lighting kits and the largest sound systems money can buy.
Slackware is clearly a Subaru Impreza, at one point the best World Rally Car but hasn’t been a contender for a while. Almost all are owned by rally fans who spend fantastic amounts of time tinkering with the car to get set it up an ultimate rally car. None of the owners race cars.
OpenSuse is a Nissan Cube, its insanely practical. It should be the modern boring family choice, but it manages to ve too quirky for your architect while not practical enough for van drivers.
I don’t know the other distros well enough.
I run Debian btw
QT is a cross platform UI development framework, its goal is to look native to the platform it operates on. This video by a linux maintainer from 2014 explains its benefits over GTK, its a fun video and I don’t think the issues have really changed.
Most GTK advocates will argue QT is developed by Trolltech and isn’t GPL licensed so could go closed source! This argument seems to ignore open source projects use the Open Source releases of QT and if Trolltech did close source then the last open source would be maintained (much like GTK).
Personally I would avoid Flutter on the grounds its a Google owned library and Google have the attention span of a toddler.
Not helping that assessment is Google let go of the Fuschia team (which Flutter was being developed for) and seems to have let go a lot of Flutter developers.
Personally I hate web frontends as local applications. They integrate poorly on the desktop and often the JS engine has weird memory leaks