What is better? Health or protection?

Depends on the toon.

Klu, I use him in DR team. But my protection mods are better. I mean I lost 4k health but added 30-35k protection.

Klu?

Kylo Ren unmasked. Lol.

Since he recovers health a lot I'd go health.

Also depends on what purpose. If it is your main arena team you should really focus on the toon's proper modding.

If it is outside of arena then you have a great deal of flexibility with mods.

Outside if you have 6 mods that give KRU +30000 protection, + 20000 health, 200 + speed, and what ever combos of offense and crit then you are fine.

some people like to mod him with full health and defense, as it makes usual teams like cls to time out
you should also consider to go for tenacity to avoid possible debuffs like daze or healing immunity...

I have 42k health and 80k prot. We'll see how is he going to hold.

He is getting obliterated with all this protection! I'm going to remod him for health. 80k prot ain't nothing against DR team. Klu is getting melted.

I suspect he'll get melted either way, but I can't remember the last time I've found a KRU in arena, let alone one high enough to try with my DR.