What do parties favor more - SK or Warrior?

[wisefool]

I'm about to start a fresh new character (gonna roll with Iksar) and can't decide whether or not I should go SK or Warrior. I already know the things how SK has more utility and better for solo compared to a warrior. One of the biggest things I may want to play a warrior is simply because they can dual wield and don't have to worry about mana what so ever. But most importantly... which tank do parties usually favor more of the 2? I always love playing the role of being a tank, in which a tank is best when used when in a party. I also just love being a needed class. But I rather be the more favored class for a party and not just simply " needed ".

Also, I still have never even started P99. Still waiting on my copy of Titanium which won't arrive til next week. I'm not 100% sure what to expect yet depending on the current expansions on P99 that will have effects and more/less benefits towards a SK or Warrior at the moment.