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Adium because it supports many IM protocols all in one. I need to be able to use 4 different IM protocols and I would not want four different programs to do it.
 
Adium. You can support multiple protocols at the same time, you can use many same protocol account's too. The last version wasn't stable though, you have to download the beta of it.
 
I used to use Adium but now I tend to just use iChat. I use the voice/video chat as well as MSN.

I get MSN in iChat via an Openfire Jabber server I run on my local machine, it supports other protocols as well. Though I haven't found a way of getting Xfire to work, not that there is a plugin for the latest version of Adium anyway.
 
I like both. Adium is great for multi-protocols.

However, iChat has slowly taken over the #1 spot for me since most of my friends have AIM/AOL names. It's nice having video/voice chats with them. I also use iChat to assist my parents with their computers since I can control their computer through iChat whenever I am chatting with them.
 
I'm on the border. On one hand, I love how iChat has no-frills file transfers... I also like the general messaging of iChat.



I love Adium's Chat logging. I love the fact that I can make the buddy list nice and compact. I love how when you restart a conversation it lets you see the last few lines from the previous conversation.


I would love iChat's screen sharing, but I have never gotten it to work. I also can't get the video chat to run stable.



That being said, as we speak, I'm trying to figure out which one i want to use..... :confused:
 
Adium preferred. The feel and customization are worlds better on Adium, plus the obvious such as more protocols, etc. Plus it's constantly being updated and improved, while iChat just sort of feels basic and unloved. However, if you want video or audio, iChat it is.
 
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