Just like to know what everyone uses.Theres alot of different things you can do here( like level health but then enchant gear for magicka or stamina, etc.)Tough choice imo but the majority of these for me would have to be magicka or health because alot of stamina isnt too useful to me, as you can use vegetable soup for unlimited power attacks.

I put my first 10 level ups into stamina, to get to 200.
Since stamina is really useful for sprinting and bashing.

You never really need more than 200 though, so i put the rest into health/magicka in a 50/50 ratio.

Currently on a monk/scout/sorcerer type char, and I chose 2/2/1 (Nord) until 26 and 1/1/0 after that. Warrior with Restoration and/or Illusion 1/2/1 (Altmer) and Sorcerer 3/2/1 (Nord)

I usually split the level ups evenly between health and stamina, but at later levels I'll throw in some magicka.

My current character, a Nord warrior/healer or Crusader if I were to give him a title from the old classes, is almost entirely Health based. I increased magicka/health in a 1/2 ratio until I had 150 magicka and since I have gone health only. My magica is fortified by the Atronach Stone, so I have 200 magicka at my disposal, as well as some 300 health by now. I still have 100 stamina and I don't even use the Respite perk, so my power attacking is limited, especially since I use a warhammer.

Pure mage 3:1:0 magicka, health and stamina.