I really don't like Attack Attack IMO. I think Attack Attack is more like a screamo with other random elements in it. No offense to Attack Attack fans, but that band is horrible IMO (including Crabcore).
Death Metal, I think it really depends. First of all, metal has so many subgenres and many sub-subgenres in subgenres. Brutal Death Metal, technical/progressive death metal, Classic Death Metal, Melodic Death Metal. Some death metal incorporate Thrash, speed, etc, and there are just too many.
You might want to listen to Melodic Death Metal first. Arch Enemy (maybe children of bodom), Amon Aramth, Dark tranquility, etc...
But if you are going into Death Metal genre, then I think it's better to listen to Opeth (progressive death metal) first because the death growl is very clear and it's music is easy to understand. Then maybe listen to Cannibal Corpse.
Death Metal like Brain Drill or Slaughterbox is hard for "metal-noobs" to understand the music. They are just too technical and has too much thing happening. Necrophagist is easier to understand the music although technical. There is also Dying Fetus.
Many bass players who put their pride in their finger techniques use fingers for playing, and I personally find finger users to be more "impressive".
Cannibal Corpse (their earlier works) are quite good to get an idea of Death Metal. If people say Death Metal, first thing I could think of is Cannibal Corpse. They didn't start death metal, but I believe they were the main reason for the breakthrough. Bassist of Cannibal Corpse use finger and is quite impressive, but he rarely shows it off on the songs. Even when he does show it off, he doesn't show his best. Might wanna listen to a song called "Hammer Smashed Face". Best song to get the idea.
Necrophagist has great finger-style bassist too. The tapping is definitely impressive. Though it's a bit technical.
Opeth is great. The bassist doesn't do anything so technical, and their songs are easy to understand.
Origin is good too, especially in their song "The Aftermath" but the bassist, although he plays in finger, has very very VERY unorthodox way of playing.
Blood Red Throne is also good to listen but it's not as popular. The bassist of this band has great finger techniques.
Listen to them and get the idea of Bass in Death Metal. most pick bassists don't stand out so much though. Though there are exception like Dying Fetus, most pick bassist don't do so much. If you want to show off, then finger style might be the best way