both the same really if you have an unlooper to unlock the cards but there are some rom 10's that can be unlock via programs so best bet is a 10 have a read around and you will find out witch one they are
but i would say your best bet is an atmega card easy to do and still updates like a rom card and only about 7 quid to buy
I did a ROM 10 without the slightest clue what I was doing and it worked 1st time. After about 50 PPV's it needs erasing and rewriting and I can get back into the card and do this everytime with my Dynamite, no hassles at all.