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My gut says always: most of the times turn-key stuff has weaknesses and good libs with perfect apis, well maintained and with a great community are rare but they are there of course.
Hard question since what the gut says is more fun while the alternative is just about gluing libs together. But using libs and once they don't fulfill your needs build yourself is the right but more boring way to go.
I am really dependent on static types so take my take on this with a grain of salt :)
Flutter is more mature right from the Dev tools to the overall ecosystem. The types are first class and make it a joy to use. Not to mention the libraries are better quality and stuff works even when you upgrade. I could never work on any RN project for more than 1-2 weeks without something or the other breaking and me cursing out aloud for the really shitty (again subjective) state of things. I am used to having codebases just keep on working almost forever.
"Unfortunately, Vaio commits a huge blunder when it comes to the fan control. Ideally, the fan should not run at all while the device is idling. The opposite is true for the Vaio SX14: The fan always runs with 32.5 dB(a), which is definitely audible. Under load, the fan becomes much louder with 43.9 dB(a), which is annoyingly loud."
https://www.notebookcheck.net/Vaio-SX14-i5-8265U-FHD-Laptop-...
I really like some VAIO models, as I think quality is superior to Thinkpad. So I wish they took a bit more care with these issues. Their recent fanless convertible suffers from coil whine. Some online reviews discuss this too.
Nowadays, I tend to miss real Thunderbolt 3 ports on USB-C, better 2 than 1 and with 4 lanes. This is what they totally forgot. So I could connect to an ancient VGA projector but not to a common 2x 4k@60hz display setup? This doesn't make sense.
My experience is that the fan controller is quite badly designed, and the machine ends up being noisy. The fan RPMs oscillate a lot, even under no load.
I hope it is not the case this time, and we end up with a nice laptop that can run Linux well. Options are limited, so an alternative with many ports from a quality manufacturer is more than welcome.