| Status quo | Proposal |
|---|---|
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| Dialogs end with the Cancel button, so after you scan the dialog, you'll need to move your eyes back to the OK button to click it. | Your eyes end on the OK button, so you can immediately click it. |
   |
  |
| OK button position is inconsistent between dialogs. It can lead to confusion and misclicks. | OK buttons are always on the end. |
 |
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| In complex dialogs, finding OK button may take a bit longer. | If you are aware that OK buttons are always on the end, you can immediately find it. |
 |
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| It lacks consistency with wizard dialogs (e.g. most OS installers, Plasma Welcome app). | Cancel buttons imply going back. OK buttons imply going forward. This button placement is consistent with pagination buttons in wizard dialogs. |
According to this, I think we can safely say that the Cancel/OK button placement is more popular in the design world. Most big players are in favor of it, notably:
Facebook website has also adopted it (screenshot), but I couldn't find their design doc regarding it.
