I would say 2600 is more counter-culture / anti-authoritarian / political, and Phrack is more just about the technical stuff. To give a recent example, 2600 gave their support for BLM:

https://www.2600.com/node/37570

Which lost them a bit of support (although perhaps gained some as well?).

2600 is also pretty good at never missing an issue (quarterly), and also runs actual prints.

That said, Phrack is where I learned things like this (not that I have ever or will use the knowledge):

http://phrack.org/issues/1/7.html

So it has it's counter culture roots.

Edit: Which I actually just noticed is from 2600 so I guess the point stands?

Ohhh, that's where this came from!

I directed a short film in the late 90s and we used this as an 'event' at a party (minus the floating part). We removed the glass from a light bulb to act as a remote fuse. Acetylene was perfect, as it gives this wonderful 'crack,' much better than the LPG we first tried. It was Tim's idea.

Please do not try this!

2600 is highschool gym class, Phrack is a pick-up game between pro ball players

2600 had paper issues and local meetups all over the place.

Print copies of 2600 are very much still a thing. I saw plenty on the shelf at the local Barnes & Noble store as recently as last night.

There's also still a local meeting in Raleigh, although I understand it's somewhat lightly attended these days.

Had? Im pretty sure I saw my local MicroCenter have issues of 2600 recently (which I also find somewhat amusing)

It’s also available at Barnes & Noble.

There were meetings last Friday.

https://www.2600.com/meetings

has in both cases.