I still have never ran deca but I am currently running Test 500mg, Tren 700mg, Mast 400mg. Seems to be alot of people that think you need more test than tren or deca but i don`t think it is necessary. Any dose of test even trt amount should be sufficient.
Unless you're using the deca for joint health or something I'd say go with the test. Less difficult to recover from and you don't have to worry about taking a dopamine agonist, whether you can or can not take nolva if you get a gyno flare up, dropping the deca early enough not to affect your pct, deca dick etc.
I think the test + dbol will work out real nice, if gains are the only concern I'd just go with that and make things simple.