NYCDM(the style and known sound and almost all NYCDM acts most broken up): Suffocation,Pyrexia,Baphomet,Internal Bleeding,Morpheus Descends,Malignancy,Dehumanized,Disfigured,Entorturement,Wasteform,Skinless,Disciples of Berkowitz etc.... very groovy style DM with some hardcore elements if not having a very uplifting feel to them and something that just about anyone can get into regardless back ground. or just being more technical,complex or insane. Makes you want to mosh your ass off. Usually(not all) strays from regular song structure and lacks repetition but remains catchy. Lyically themes, regular life issues, personal problems etc.. you name it anything that goes on with humans. Very reality based and less fantasy if any at all involved(one of the few metal/death metal musical styles that is not fantasy involved or uses little. Immolation is from NYC but strays from the groove style and lyrical themes of the other bands or those things in general and goes for a more dark and dissonant/akword guitar sound.
Florida DM: Brutality,Cannibal Corpse(originally from Buffalo NY but relocated to be apart of the uprising scene in Florida(thought it would be a better move) and to record there disks),Monstrosity,Malevolent Creation,Obituary,Morbid Angel,Resurrected, etc..... Very thrash infleunced DM taking it just a next step from Thrash(some adding alittle more technical edge and lower vocals). Very Slayer and thrash in General infleunced... Some being depression or gore based(not all)
Cali DM: Disgorge(starters of the Cali scene in 91,92),Deprecated,Decrepit Birth,Deeds of Flesh,etc..... Based more on full on brutalily and blasting. Most lacking melody or actual full on riffs or song identity. I noticed with a lot of these artists. It is mostly single notes with random harmonics and mutes thrown in. Lacking any structure or catcheyness while remaining very predictable(you know what is next since they do the same things everysong. Gorebased bands(while some touching on some other subjects)
Pseudo NYCDM: Vomit Remnants,Disavowed,Pyaemia, etc..... Bands that emphasis on replicating NY style groove DM(especially Suffocation in General). Damn.. who does not want to try to sound like Suffocation and fail ?
By meaning Fail not that these artists suck they just can't pull it off. Disavowed trys to hard and fails.
I tried to sum this up all fast but I think I got generally what it is about whether you agree or not.