Re: Seeking advice: Should I install Sims 3 on Mac or Windows?
@NiiChavo I personally don't enjoy playing the Mac version of Sims 3. Even though my laptop can handle it, the camera movement is choppy, some interactions are missing, and there are some weird graphics errors that take away from my enjoyment. Other people are reasonably happy, although I think we're all still hoping for some more fixes.
The most important question though is what hardware your Mac has. If it doesn't have a dedicated graphics card, as in, it's a 13" MBP with only integrated Intel graphics, then the game may not run well enough to meet your expectations, particularly if you like to play with Pets. A number of people with Intel chips have had to uninstall Pets, turn down a couple of graphics settings to the minimum, or both.
The game still runs fine on Windows 10, at least on sufficiently strong hardware. For your Alienware, if it has 8 GB RAM, you really don't need more unless you plan on multitasking. (But then you have a Mac that could be sitting next to you for that second-screen experience.) Your CPU upgrade options will be severely limited by the motherboard: Intel changes the socket every two years, so even a 2016 processor likely wouldn't work with a 2014 board. Graphics cards are much more flexible, provided you have a sufficiently strong power supply. On the other hand, new and new-ish GPUs are sold out almost across the board right now, unless you want to pay a 60-100% markup.
Anyway, if you want to talk specifics, let me know what hardware the Alienware has—processor, RAM, PSU, current GPU—and we can go through your options.
As far as getting the game running well, the same mods are recommended in both Windows and macOS. This is a good place to start:
https://www.nraas.net/community/TIPS-FOR-BETTER-GAME-PERFORMANCE
The only EA worlds that have serious issues are Isla Paradiso and Bridgeport. IP is basically unplayable on any system unless it's edited; Bridgeport doesn't always need as much help, and the problems are mostly limited to elevators getting stuck and issues with how apartments are constructed. I can go into more detail if and when you'd like to play either world. There's no reason not to install the packs though, again provided the computer running them can handle the load. The content of each pack works fine in any other world.