Health/magicka/stamina

[Vayne]

So...after level up, i can only pick one. Which one more useful?

[Tavman (4)]

Health and stamina. Magicka is okay in the beginning until you enchant your armor to reduce the spell cost to zero.

[EvilPie]

If i´m allowed to say.... it´s pretty useless to level your magicka, you can suppress the cost of any magic to 0 enchanting your gear ^^

[Kasane Randell MFer]

Mostly depends on what kind of character you are trying to play/make. Health give you, well health. Stamina gives you X amount of power attacks. And it gives 5 points of carry weight for each point in stamina (That you put in through leveling). And magicka is basically the same with stamina on power attacking, but for spells and how many you can do. Like above says, you can eventually get gear enchanted or find to make a certain spell school to be cast for free.

[LairosTall]

I usually put the first 4 levels into stamina, whatever the build, then the remaining levels worth into health, up to lv10. After that it really depends on the build.