laptop specs

@jmelrokmi  The G-sync feature isn't really necessary for Sims 4—you can accomplish essentially the same thing with software, and usually the built-in Nvidia Control Panel is sufficient.  But you might find it's nice to have at some point, and for $20, why not.  For the hard drives, I'd get a single one rather than two in RAID 0.  The performance gain from RAID 0 is uneven (and sometimes it's actually slower), and an NVMe drive is already so fast you won't need any boost.  Getting a single drive leaves the second slot open if you ever decide you need more storage.

If you're only planning on playing Sims 4 and the as-yet-nonexistent Sims 5, the Nvidia 2060 is sufficient.  If you think you might like to play other, heavier games at some point, and you're willing to pay the extra, the 2070 Super would be a good investment.  But it really depends on the games.  From the (very early) look of it, Paralives wouldn't use the extra speed, and Cities Skylines doesn't either.  Games like Tomb Raider definitely do, especially at higher refresh rates.

For the memory, 16 GB would be enough for me.  I've never had more than about 11.5 GB RAM in use in all the time I've been watching, and that was in one specific game that's a memory hog.  Even with significant multitasking—playing Sims 4, having a couple browser windows open, and editing your screenshots in real time—I doubt you'd come close to maxing out RAM use.  But if you'd like to check, open the Task Manager on your existing computer some time and see how much you're using.  The values can be displayed as percentages or absolute totals; right-click on the Memory header to switch.

Also, RAM can be upgraded easily, so this is the least important of all the decisions.  In fact, buying the full 32 GB and installing it yourself would currently be cheaper than the $150 Dell is charging to do it for you.  (I don't know what it would be with your discount, but a 2x16 GB kit is about $110 sold separately.)  On the other hand, if you never want to have to think about it and are willing to pay for the upgrade, it's a reasonable investment.  It's really not a bad decision either way though.  Personally, I'd do the upgrade myself, but a) I wouldn't be getting a discount, and b) I'd be comfortable messing around with my laptop components.

The bottom line is, this is going to be a very good laptop no matter what you choose.  Even the baseline would be more than fine for Sims games.