@Bcky44I don't have all of the packs but I do have 4 EP's, 3 Game Packs, and 3 Stuff Packs. My Sims 4 folder in Program Files takes up just under 25 GB. I do use lots of CC so that plus my save files take up another 4 GB. A 256 GB SSD should be plenty, unless there are a bunch of other things you plan to install on it. You can check the Properties of your C: drive to see how much storage space you are using on your current computer and decide if 256 GB is too small.
I do keep a 1 TB USB external drive for backing up all of my personal files (including Sims saves, trays, etc) in case my HDD crashes. Those are always a good thing to have no matter how much storage you have on your laptop. You can get a 1 TB (1 TB = 1000 GB) USB external HDD for under $50.
I'm pretty sure Sims 4 would look & play awesome on any of those gaming laptops listed above. I play on a regular laptop with a slower CPU (i5 gen 4), less RAM (12 GB), and just a regular integrated graphics card. I keep all the game settings on medium or higher (I never use laptop mode) & everything loads plenty fast, no lags, and with no crashes ever. I know it would look & play much better on a gaming laptop! I do most of my gaming on XBox One though.
I currently have a 15" and like it fine but I used to play on a 17" and that was pretty sweet but the thing was a beast and felt big at times. I had to haul it around everywhere though. If there is some way you could go to a local store and see for yourself the size difference that might help you decide. If you shop on Newegg you can also check User Reviews to see how others rate each model. Avoid anything that has too many negative reviews.
One final thought- high end gaming laptops can run hot so make sure to use some kind of hard surface, laptop tray, etc, and consider buying a laptop cooling pad.
@puzzlezaddict if you have any other recommendations that would be awesome! I've read your other posts and you give great advice on gaming laptops & all that other good stuff. :D