@CheeseandAciddd Once loaded, Sims 4 should run the same on an HDD as it would on an SSD. The loading times will be longer on an HDD, of course, but you shouldn't have stuttering in live play. The cause is probably not the drive, but some other factor.
The first thing I'd do if I were you would be to manually limit your in-game framerates. An Nvidia 2060 is powerful enough to generate fps far above the refresh rate of your monitor if you're playing at 1920x1080. That can cause stutter as well as a variety of other problems. To see fps, bring up the cheat console (crtl-shift-C) and enter "fps on" without quotes; a number will appear in the lower left corner of your screen. ("fps off" makes it go away.) If it's consistently high or fluctuates wildly, that could easily account for the stutter.
If you need help manually limiting fps, let me know. Even though the in-game setting works, it might be better to use an outside tool like the built-in Nvidia Control Panel. And regardless of whether your framerates are too high, test in fullscreen, windowed, and windowed borderless modes to see whether the stutter is always there.
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