There is no comparison, Deca whoops EQ's butt, no question...bigger gains both in terms of physical growth and strength, as well as joint relief.
As for the cons of Deca, everyones always scared of "Deca Dick" and holding too much water, this is unfounded concern. First, like we have said 90 bazillion times on this board keep test/deca ratio's at a 2/1 average and you'll be fine. 2nd, take your AI's and water or bloat will not be a problem, play with this and find the right dose of say a-dex that works for you...letro works too but a-dex is better IMO.
Don't missunderstand me, I'm not saying EQ is a completely inferior drug, I'm simply answering the question as to which one I believe to be better. EQ does have some good qualities, like Deca an increase in strength and mass will occur, but not to the same degree. A lot of guys like EQ in a bulking cycle because it rapidly increases their appetite, and a lot of guys like it in a contest prep cycle because they feel the gains are, for lack of a better word cleaner. Bare in mind that some will still use deca as part of there contest cycle and with good results...BigIronMike25 who post here used deca in a 16 cycle for a contest he did this past June and he came out looking great. I can't remember how long he ran it during this cycle but is was at least 8wks maybe a bit longer.
As far as doses, 400mg/wk of Deca will work fine for most people and is the standard dose. I ran 600mg/wk in my last Deca cycle and honestly I did not notice much of a difference then if I had run 400mg/wk. So more is not always better or necessary. As for EQ 400-600mg/wk will suffice.
Duration for both 12-16 wks is standard, no less then 8wks is preferable but a 12wk minimum would be much more sound.