Older iMacs sometimes have display issues (washed out colors, cloudy areas etc.) from the heat of all the internal components. Some older iMacs also had issues with dust having crept behind the glass. Did you check the iMac forum here at MacRumors?
For the heat issue alone I feel that a mini is the better option (next to allowing free choice of monitor brand, size, curved etc.). On my 2012 i7 mini (upgraded to 16GB Ram) I could drive an UWQHD monitor (i.e. 3440x1440) via Thunderbolt together with a FullHD monitor via HDMI without stuttering.
And if it’s harder to find a good offer for a mini (as you say), that may be because others see it similarly ;-)
Just not clear to me: Which mini does your wife use? As you mentioned a 2010 iMac, I assumed your wife may be on a 2010/2011/2012 mini. If that’s the case, it may be sufficient to upgrade it to an SSD to eliminate the stutter. If she’s using a 2018 base mini, try to avoid scaled resolutions to reduce the probability of stutter.
For the heat issue alone I feel that a mini is the better option (next to allowing free choice of monitor brand, size, curved etc.). On my 2012 i7 mini (upgraded to 16GB Ram) I could drive an UWQHD monitor (i.e. 3440x1440) via Thunderbolt together with a FullHD monitor via HDMI without stuttering.
And if it’s harder to find a good offer for a mini (as you say), that may be because others see it similarly ;-)
Just not clear to me: Which mini does your wife use? As you mentioned a 2010 iMac, I assumed your wife may be on a 2010/2011/2012 mini. If that’s the case, it may be sufficient to upgrade it to an SSD to eliminate the stutter. If she’s using a 2018 base mini, try to avoid scaled resolutions to reduce the probability of stutter.
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