Well..... Depends on what you are submitting really. Myself, I am an IGC fan. I believe that having coins holdered is simply protection for the coin to be enjoyed by future generations and ICG is quick and cheap. If you are building registries or trying to get maximum resale value then you probably want to go with PCGS or NGC.
Your poll makes no sense... only one of those is a coin grading service. As for your question - I buy NGC as much as possible.
It all depends on what you want graded. Done are better at error coins, other gold coins, etc. Welcome to CT.