I would go with EQ over Deca anyday!! Same results and less sides!! You should be fine with 600mg/week, as far as whats harder on your hair line, it all depends if your predispossed to it or not!!! You can always take stuff to protect your hair!!!
Haven't tried Deca but I didn't like EQ tooo much excpet the hunger it gave me. I will do Deca/test/dbol next. I would just try either bro, only one way to find out what works for you. Good luck