@skajsms Both of those options are fine for what you want, but you can definitely do better for your budget. I'm not going to list all possible examples (there are so, so many), just the best option of each kind I found in a quick search; if you want to see more like any of the ones below, just ask.
In terms of a laptop in the same class as the Dell, this MSI is better in every way: it has a stronger processor with a graphics chip that's a bit faster, it has double the RAM and double the storage, and it's on sale for $660 right now. While you don't technically need the extra memory (you could upgrade the XPS if necessary) or storage (you could use an external drive if it came to that), both are nice to have.
https://www.bestbuy.com/site/msi-modern-15-6-laptop-intel-core-i7-16gb-memory-512gb-ssd-carbon-gray/6427572.p?skuId=6427572
A slightly smaller alternative is this 14" Acer ($700), with 8 GB RAM but otherwise the same hardware as the MSI:
https://www.bestbuy.com/site/acer-swift-3-14-fhd-ips-widescreen-led-laptop-intel-core-i7-intel-iris-xe-graphics-8gb-lpddr4x-512gb-nvme-ssd/6498790.p?skuId=6498790
In terms of gaming laptops, it's true that most are somewhat heavy, at least at the entry level, and the few that aren't usually run hot and loud due to their meager cooling setup. (That's one way to keep the weight down.) This is an exception though:
https://www.amazon.com/ASUS-Display-GeForce-Keyboard-G513IC-EB73/dp/B09DDJ84WK
It weighs 4.6 lbs, which isn't exactly light but is certainly manageable, and its graphics card is faster than Sims 4 needs now or probably ever. It's also the entry-level version of a higher-end product line, so its build quality is very good for a gaming laptop in this range. It does only have 8 GB RAM, which is sufficient for Sims 4 although perhaps not for heavy multitasking, but the memory is expandable, and a second RAM stick would probably run you about $40 if and when you wanted to upgrade.
Another alternative I saw is this Acer:
https://www.amazon.com/Acer-SFX14-41G-R1S6-Creator-LPDDR4X-Backlit/dp/B093TK1PXF
It's basically a gaming laptop in a lightweight (3.3 lbs) chassis. It actually has an even faster graphics card than the Asus above, plus 16 GB RAM. While I wouldn't expect this model to squeeze every bit of performance out of its hardware—that's just not how lightweight laptops are built—I'd still expect the graphics card to equal or beat the one in the Asus given its starting advantage. Which is to say, this laptop is also more than fast enough to run Sims 4 on ultra settings.
I wouldn't expect to find other models like this last one in your price range, but for the others, if you like one category but want something a little different, I can do a more thorough search. Just let me know what details matter to you.