I'd say that DEP and Converge are a different type of brutal. Whilst Im not knocking it technically, the more mathy side of extreme metal has generally got the whole abrasive/calculator sound to it to make it more extreme. Making brutal music that is still based on simpler riffs (no tapping jazz runs and paradiddle drum beats lol) I think is slightly harder. I think how much you like the Converge side of things depends on how you came to extreme metal. I came to it from like Iron Maiden led to Megadeth, that led to Slayer, then to Morbid Angel, then Cannibal Corpse, then Hate Eternal. But if you've come to it from the hardcore side of things you're opinions will be different. And you'll have a silly cap and a spangly belt. Fact.
Although you cant beat Panasonic Youth
Plus personally, I think the deeper vocals are much more brutal. I agree with having a break from the vocals with clean singing but then it just starts getting a bit metalcore. And no-one wants to sound like As I Lay Dying. That said, it can be done, just takes some talent. Opeth kinda pull it off (when theyre not being boring as fuck). Although with Whitechapel, All Shall Perish, Through the Eyes of the Dead, The Black Dahlia Murder etc you dont actually think "hmm these vocals are getting boring" as they're quite varied.
And I see you're DEP and Burnt By The Sun and I'll raise you Guttural Secrete (wont post a link as theyre definitely a bit far into the splatter gore side of things lyrically - not that you can tell haha)