I think that there isnt a "best" smartphone on the market, both IPhone, android, and windows phone all have their benefits and downfalls. For IPhone there is a large number of apps but that really isnt a big plus because most of the same apps are on at least android. Granted the IPhone is very user friendly but like most of there products they are limiting to what you can customize and change. Also to those that say that the Mac operating system is the best just know that it is just a distribution of Linux. Most of the features of Mac os is by them but the key functionality is Linux.
For computers, the home computer will not go away. There will always be a place for them, however they may change. For the best computer is very arbitrary, the best depends on what you want to do, i.e. for game it would be custom build with two GPU and a octa-core processor or better with a high thread count. for business some thing with great battery life, productivity and processing power like a macbook pro. I could go on.
For gaming systems, among the conc0les neither are better than the other. People will have their opinions but from pure states they are almost the same. The PS4 does have slightly better specs. But Nintendo will all ways beat Microsoft and Sony, the overall fan base is large (with some overlap) but the games are simply better. To consider everything PC gaming is simply better because you are not limited to the consoles power for however long it take to release a new one. But PC are not, the games are bigger and better with more depth and capabilities then any concole game (this statement excludes any cross platform game, cod, battlefield, assassins creed, etc...).
For now the Surface 3 is probably the best. I dont know much about tablets.