My next cycle will be Test and EQ. I've done a lot of reading and chatting about this. Based on what I've learned about Deca and EQ, I would recommend EQ. It has far fewer sides than Deca (Deca-dick is apparently NOT a myth--and even if you took enough test to counteract it, you're setting yourself up for the possibility of more sides due to the high levels of test).

Best to you. Let us know what you end up using.