Alex,
This is a tough question. Every ARTCC in a sense has a grace period in which you will need to catch up on your studies and get up to speed on the new policies and regulations included in the 7110.65 since your last time controlling. You need to simply ask yourself, what do you want to get out of it? There are benefits in each and every ARTCC and they vary, but one thing to keep in mind is that we all have the same expectations - and that is professionalism, realism and just as important, enjoyment. I suggest you hop on VRC/ASRC/Euroscope and observe traffic patterns, activity and talk to some controllers personally and ask what they like/dislike about their ARTCC. I am sure you will find what you are looking for, just have an open mind and be committed to the ARTCC mission and you will succeed. Let me know if you have any further questions!