The  difference of the 3006 model and the 3007L is as followed
1. 3007L has 550ml brew boiler + upgraded steam thermoblock , which is commercial settings. 3006 is only thermoblock for brewing and steaming
2. 3007L is 2-in-1 boiler and group head design, keep the stable temperature. 3006 is thermal group head.
3. 3007L has adjustable extraction flow rate function.
4. 3007L is 3-hole steam wand while 3006 is 2-hole. And 3006 is lever steam handle design.
Both Two models all have PID and double display screen design. If you prefer barister operation at home, 3007L is better. If this is your first espresso machine, 3006 is enough.