In general, the whole point of an ultra-wide is to not need two monitors.
If you do a lot of visual work or viewport-specific css, I'd probably go for a single large higher-res (4k or 5k) screen.
If your often context switching between tasks and need to monitor those tasks while they're running (writing/photoshopping/whatever while a video is encoding), two 16:9 screens can be handy.
If you spend a lot of time looking at code and the output of that code (web dev, game dev, etc...), I'd go for two 16:9 screens but place one of them in a portrait orientation and put your code on that screen. That way you can look at your results on a regular screen and refer back to your code on the vertical screen.
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In general, the whole point of an ultra-wide is to not need two monitors.
If you do a lot of visual work or viewport-specific css, I'd probably go for a single large higher-res (4k or 5k) screen.
If your often context switching between tasks and need to monitor those tasks while they're running (writing/photoshopping/whatever while a video is encoding), two 16:9 screens can be handy.
If you spend a lot of time looking at code and the output of that code (web dev, game dev, etc...), I'd go for two 16:9 screens but place one of them in a portrait orientation and put your code on that screen. That way you can look at your results on a regular screen and refer back to your code on the vertical screen.