Insane? Hardcore? distinguished mentally-challenged?
I couldnt play the game(original not pirated) on the emulator because it is crashing quite a bit. So i am buying it just becasue i liked SMT: Devil Survivor for the DS. BTW if i didnt like DDS will i like SMT: Nocturne? I prefer customisation to anything else in an rpg.
depends on what customization you're after. You can customize your party by choosing which monsters are in and out. Then you breed monsters for different skills. Which combination of skills you get is random, but you can keep on going in and out of menus until you get the combination of skills you want. It's also influenced by some other factors. In other words, you don't have complete control over it and it will drive you insane as you sit there for a half hour trying to get what you want.
I would file you under distinguished mentally-challenged for making a bold proclamation, then asking a basic question about whether you would like the game or not. it's like the people that buy a system then make a "so...are there games for this thing?" post on gaf.

I did like Nocturne much better than DDS though. Nocturne is easily my favorite PS2 rpg and even though it came out first, it blows the shit out of Atlus' subsequent SMT games.