There are many differences between a DeLonghi EC702 and an ECP630 espresso machine and as one can see an obvious difference is in the looks of both machines.
Another difference is their water tank capacity where the DeLonghi EC702 takes the gold with its 44 oz tank.
The DeLonghi EC702 has the advantage of having a stand-by feature and its two separate thermostats that make brewing fairly quicker.
The location of the milk frothers is also different with these two models while the DeLonghi EC702 has it on the side, the ECP3630 has it in front where some may argue is a disadvantage.