Blk. pipe vs. CU. cost& time?

Kevin for many years i do alll my hot water boilers in copper and after i started to do service i noticed alot of copper jobs that had leaks not big as lose but in is huge calium despoits .Most of all the leaks where from piping and pumps not being supported properly the copper taking all the weight of pumps ,zone valves and such ,i also figured that all the hacking i had seen was based on a guy with a saw all and a torch hacking in zones here and there usually when those guys see all steel pipe they run no tools or knoweldge to work with it .I finally stopped doing copper way before the price went up and it was cheaper then ,the labor is a draw when you add it all up ,big plus no male adp to boiler ,spriovent ,pump flanges always felt it never look pro .As for threading i use a ole ridgid 400 and i have a set of die a adjustable for in place stuff ,drive shaft and 2 1/2 to 4 die for bigger stuff and a vise .Porta band saw ids also a must in my book .Time wise i find i can pipe up most of the boiler quicker with steel and have a much better looking job when complete but you have to be use to working with threaded pipe and be confindent with your abbiliaties it just takes a little time but it surely makes you different then everybody else and the look on onspectors face is excellent some know other can't believe .It's all trail and error do what you feel you are comfortable with peace and good luck clammy