Al Quaeda and its offshoot challenger to the throne ISIS are Deobandi?
No actually. Al Qaeda follows a corrupted version of Wahabi and/or Salafi ideology while ISIS is in a league of its own. They'll probably introduce some new methodology soon, because they've crossed the limits of practically everything. Unless they (hopefully) get wiped out soon, that is.
Do you agree with
@jamahir that the Deobandis are a lot more virulent and dangerous than the Wahabis are?
There is nothing in Deobandi ideology itself that makes it more virulent or dangerous, but
@jamahir 's point about it being from the Indian subcontinent is valid in the sense that there is more instability here than it is in Wahabi areas like Saudi Arabia or UAE. Due to that instability, Deobandi mullahs are more likely to rouse rabbles and create problems than, say, Arab mullahs.
What about Barelvis? Are they cool? Something along the Sufi lines?
Admittedly there have been comparatively few cases of Barelvi terrorism, but there isn't anything in their ideology that makes them more peaceful than the other sects. Perhaps it is because they are the majority in the subcontinent and don't have to resort to violent tactics to gain political victories.
Otherwise, the same misconceptions, falsehoods and narratives that can be used to twist Deobandi-ism are also applicable to Barelvis because they ultimately follow the same School of thought, that is Hanafi. For example, the guy who shot Salman Taseer was supported by many Barelvi mullahs because of their extremely incorrect opinion about blasphemy.
It must also be noted that many Barelvis are also Sufis, so you are to some extent right about them being along Sufi lines. The majority isn't Sufi, but a good portion is.
Now here's an interesting graph - not sure how accurate it is, but it's from Dawn News, so it must have some basis.
(Ahl-e-Hadith = Salafi)
Source:
An incurable disease? - Dawn.com
Now, having some knowledge about Deobandi ideology and being close to many Deobandis, I am surprised by this. Their ideology doesn't have anything that makes it so violent. In my view, the only logical explanation is that the Deobandi political mullahs are behind this. There's too many of those around, everywhere.