mg for mg deca is shit compared to dbol.
halo don't anadrol as it can cause severe hairloss in some people. Dbol doesn't cause it at all.
If you don't want to up the dose of test too much, get the danabol ds pharma dbols. They are cheap as chips. Start with 20mgs dbol (maybe 6 weeks on, 4 off) with your test and you will get the arms. The first time you take dbol magic things happen.