Having never read any of C.C.'s books, and understanding that they have been written "out of order", should I start with "Infernal Devices" or "Mortal instruments" or does it even matter (it usually matters to me).

Thanks for anybody's opinion, David.

I havent read Series either but am getting ready to.
this how fict fact has it in the order you should read
City of Bones Mortal Instruments Cassandra Clare #1 in Mortal Instruments
City of Ashes Mortal Instruments Cassandra Clare #2 in Mortal Instruments
City of Glass Mortal Instruments Cassandra Clare #3 in Mortal Instruments
The Clockwork Angel Infernal Devices Cassandra Clare #1 in Infernal Devices
City of Fallen Angels Mortal Instruments Cassandra Clare #4 in Mortal Instruments
Clockwork Prince Infernal Devices Cassandra Clare #2 in Infernal Devices
City of Lost Souls Mortal Instruments Cassandra Clare #5 in Mortal Instruments
City of Heavenly Fire Mortal Instruments Cassandra Clare #6 in Mortal Instruments
Clockwork Princess Infernal Devices Cassandra Clare #3 in Infernal Devices

I have read the Mortal Intruments. They were great!