Protoss is pretty easy to start off with and powerful. You can build buildings faster and get more work done because instead of your probe having to sit there and construct the building, he just warps it in and it basically builds itself. Protoss does cost more minerals, gas, and supply, but that is because they are really powerful. For example, one Zealot is 100 minerals and 2 supply.
That zealot can easily kill 2 or 3 marines. Not only that, Protoss are GREAT against Terran because Terran usually goes Marrine Marauders, and Colussus and a decent ground army will easily beat their army. You can also cannon rush which is really funny