Re: [MAC+PC] Sims 4 and new laptop
The Sims 3 is not compatible on any Mac with Intel Iris graphics, the 2015 model MacBook Airs with Intel HD 6000 graphics and the 15" MacBook Pro with AMD Radeon R9 M370X. It may be possible to play but you have to manually alter the GraphicsCards.sgr files. For more information please read this thread.
Regarding The Sims 4, you should be fine but bear in mind that as the game progresses and more EPs/SPs/GPs are added the more bogged down the game becomes so if you have a Mac with integrated graphics only (all 13" MacBook Pros, entry level 15" MacBook Pro, entry level 21" iMac, all MacBook Airs, all Mac minis) the game may struggle more so gameplay will be affected. At the moment most Mac players are playing with only minimal problems.