My opinion on the subject(as a 1v1 player that never morfs to ecell) is that you do not need to have your E=M income, what you need is not to excess, wich is in fact a difrent thing altogether...
[proof=math]
total metal you can ave to spend in first minute
500+(4*60)+(2*52)+(2*44)+(2*36)=1004M
base+com+1+2+3(mexes) asuming 2m/s mex
with morf
total e
500+4*60+6*30-300=620E
base+com+ecell-morf cost
total m
1004-300=704
total-cost
total BP
(10+10)*60=1200 free bp
600-225=375free com bp
base-mex-solar
84e shortfall, 620 free spending
without morf
total e(3 solars after 3 mex)
500+4*60+2*29+2*22+2*15-210=662E
base+com+1+2+3(solar)-cost
total m
1004-300=704
total-cost
total BP
(10+10)*60-240=960 free bp
600-225-240=135free com bp
base-mex-solar
42m shortfall, 662 free spending
conclusion:
no-morf is 42e more efficient then morf
both morf and no morf have (huge)excess build power to spend
[/proof]
[proof=strategy]
at the start(first 1 minute) you do not need power at all, you have 500e/m in storage and +4(from eco com) giving you a total of 740E+M to spend in that minute
asuming you build at the maximum 20bp (lab+com) you can only spend 1200e/m in an ideal world, but often you spend less then 600e/m due to movment/building opening times ect...
in the first minute you need/can only build 3mex +2llt +3raiders (iregardless of your strategy) this costs 225+180+~300 = ~705e/m
leaving you ~35e/m
you need 300e/m to morf, thus morfing means you must stand around and wait for at least an extra 26.5seconds at the very least to finish this basic prep (longer since it takes (min)22.5 seconds to build 3 mex (actual time ~35s))
to build the 3solars/wind gen takes only 21seconds, if you build your first soalr at 22.5s (when you built 3 mex) you do not e stall are effectively faster then the morfing comm
[/proof]
TL:DR
morf eco com takes a theoretical 1:35 seconds to leave the base
non-morf eco com takes a theoretical 1:21 seconds to leave the base
non morf com is faster then morf com (and can later morf into combat orientated morf com)