Duckman is correct.
Both Pathfinder and 5th edition are really fun to play. Pathfinder just has a little more number crunching and I'd like to think you have a lot more options in creating a character. However it depends on you as a Dungeon Master, Can you remember all the modifiers for different effects?
Personally I like pathfinder because of the little bit of number crunching. Then again I play hackmaster and 2nd edition a lot.
Also before you buy any starter set you should can ebay, theres a good chance someone is offloading a small collection which can jump start you in.