However, arch breaks things often, very often. You make updates crossing fingers you will be able to reboot. Debian, crunchbang, overall, is very stable.
It depends what you want. If you are not a linux guru and need to work on your system, then go for something easy and stable like debian, otherwise do go for arch.
--- Edit
Yes, I talked all the time about Debian and I missed #!. Let me say, crunchbang for me it's just an easy way to get a debian testing. I prefer it like this as last time I used Debian it had some rough edges I have no time anymore to smooth over. I want things to work out of the box and a good community, check #!, they actually have a nice welcoming community.