Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5F136 Safari/525.20)
I suppose it depends on what you are looking for. Beejive keeps you logged into your IM services for up to 24 hours when you close the app. IM+ does not (logs you out). Beejive has instant email notification (MM, exchange, yahoo) of a received IM when app is closed. IM+ does not. Beejive UI is far superior. Since Beejive keeps you logged in when closing the app, I plan to start using my iChat account for texting allowing me to decrease my text plan by $10/month. Beejive will basically pay for itself in 2 months time.
That's all well and good, but why are people pushing the idea of email/sms notifications? Once Apple stops screwing around and releases the update with push notifications, that's going to be a non-issue.
Better UI? Maybe, but I'm not particularly willing to pay $16 just for a marginally better UI, especially for an IM service that's free to use to begin with.