In my opinion no.
I have seen the "combo" trucks dyno they put out about the same numbers as an Edge Comp, if they are combo trucks with say a "competition program" the Edge Drag Comp will hold its own with any of them.
So, I would suggest which box best suits your needs.
If you go with a Blue Chip FMS or TST PM3 I would suggest keeping the EZ to piggy back, if your going Edge Comp you can sell the EZ and put that money towards a Drag Comp upgrade.
--Justin