Angband is good because it's a lot more tactical than the others. It's simpler in some ways.
NetHack is an amusing game, with lots of silly stuff. But a lot of it is about exceptions to the rules, rather than the rules themselves. And lots of obscure stuff. e.g. it takes quite a while for people to learn that the fountains are almost useless.
Angband is much more a game of tactics, inventory management, and knowing when and how to run for it. Yes, it's harder to start than NetHack, but it's a *lot* better than NetHack once you have. Provided you're careful, once you've gotten to the midpoint of NetHack, the rest of the game is usually easy. Angband gets harder as you descend, and you have to be more and more careful.
If you're relatively new to Angband, your best bet is to play as a Warrior or a Ranger. They're powerful enough to get you started, and allow you to get into some of the deeper levels, where the monsters attacks become more interesting.
Also, a correction - since the new maintainer of Angband took over, the new official Angband site is
rephial.org, though Thangorodrim has a lot of the stuff for previous versions. The site that gets most activity is the one that tracks all Angband variants, and does a lot of stuff too -
angband.oook.cz. That's probably your best place to go.
Don't get me wrong, both are a great deal of fun, but they're entirely different philosophies. Angband is more... serious, for want of a better word.
Also, there's another roguelike game you might be interested in - ADOM. It's not been updated for a while, but the community is still active and it's a rather good little game. The difference is that it's closed source. But a large amount of the mechanics have been deduced by player experimentation. It can be found at
adom.de
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