I find it odd that Klingons consider eating meat live and/or raw to be more 'warrior-like".
We humans not only kill animals and eat their flesh..we burn
Not all the time. I like raw meat just as much as I like cooked meat.
As for which one is best between vegan, vegetarian, omnivore, or carnivore... As I see it, we have teach to tear meat and plants, enzymes in our digestive system to break down both meat and plants, our bodies are essentially built to use both meat and plants.
Beyond that... it just boils down to all things in moderation. You need, or rather I need since I wouldn't presume to tell you what you need... a balanced diet that doesn't simply cut something totally out of the equation.
Now, if for whatever reason you're allergic to something, thats different. Then you HAVE to adjust your diet to avoid that. I know someone who didn't eat beef for the first 20 years of her life. Chicken, fish, pork, fine. But no beef. Now, if she eats beef, she does get sick cause her body just isn't used to it anymore. Does she cut meat out entirely? No, she just doesn't eat much of that type of meat.
Now is being a Vegetarian a perfectly legitimate diet? Yes. If you know what you are doing, you can be a vegetarian, and even a vegan, without the need of supplements. You just need to look at what you are eating, see what your body gets from it, and plan accordingly. The problem comes up because in many cases a person will wake up one day and think "I don't want to eat meat anymore." So they go and cut out all meat and animal products. steak, milk, eggs, cheese, honey, and so on. The problem is, they don't look at what they need to do to replace what they just cut out and begin to have issues with vitamin and mineral deficiencies, etc.
Oh, and I can't remember the figure off the top of my head, I'll have to look through my books. But with supplements, you're body is only able to absorb a fraction of whats actually contained in that little pill.
Bottom line. What EVER you decide to do, look into it. Ensure that you are getting what you need, and that you aren't harming yourself. That way, whatever way of life you choose will be good for you.