Comparison between The Sims 3 and The Sims 4

The Sims 4 has some features new to the series; in the same time, many features has been lost since The Sims 3.

New features

 * Create a Sim: Hands-on interface.
 * Build mode: Improved and easier
 * The Gallery
 * Traveling across worlds / neighborhoods without losing relationships, inventory or any other data
 * Emotions: each emotion allows unique interactions
 * Multitasking
 * Sims can resurrect other sims from a book called "The Book Of Life" in which sims themselves can create.
 * Museums
 * Comedy clubs

New Objects

 * Rocket ships

CAS

 * Pants are tucked in under boots
 * Headwears and hairpieces are now separate

Little Features

 * Breastfeeding
 * Delete and move objects Sims are using without the  cheat
 * Sims can wear any hat with any hairstyles without changing the other

Returned features from previous expansion packs

 * Cowplant
 * Voodoo doll
 * Nightclubs
 * Violin
 * Grand pianos
 * Cupcake machine

CAS

 * Create a style no longer possible.
 * Teens and proceeding life stages are all the same height
 * No opacity slider for makeup

Life states

 * Toddlers

NPCs

 * Repairman
 * Firefighter
 * Police
 * Burglar
 * Gardener
 * Butler
 * Social worker
 * Nanny

Objects

 * Dishwasher
 * Pool
 * Newspaper
 * Cars (they exist only as ambient decorations)

Cheats

 * constrainfloorelevation
 * familyfunds

Build Mode

 * Changing ground/floor elevation (the lot is completely flat).
 * You can't have foundations on one area without having them on every wall in the lot.
 * Ability to rotate and/or reposition (when placing a lot into a larger one) a lot when placing it.
 * Sims 4 has a maximum of three floors, but the foundation is no longer counted as a floor.
 * Steps can't have different railings on each side (nor a railing on one side only, except when that side is against a wall).
 * No more basements

Live Mode

 * No more open world

Source(s)
http://ts4news.com/post/94541924952/89-features-missing-from-the-sims-4