Deca/EQ can be good together. Everything hits the same receptor. Do a search for AR. You will find lots of info from guys much smarter than me.
There is a lot of confusion about DECA/EQ, this started because people thought they gave similar results and could be interchangeable in a given cycle, for instance DBOL/TEST/EQ or DBOL/TEST/DECA. I personally do not agree and the side effects are quite different, there are several TEST vs DECA posts that go into detail on this.
I think you will find that most guys like EQ. But there have been positive posts about cycles consisting of both DECA and EQ.
Hope this helps, however the search is your best bet for quality info.
LC