Yes, Blackberry is better in features and quality... but costly.
If you compare Blackbery with Sidekick:
With Sidekick, you'll get unlimited text-messaging, unlimited e-mail, and unlimited internet... for $30. Calls are 40 cents a minute.
With Blackberry, you'll get unlimited e-mail, unlimited internet, and ONLY 300 text messages... for $40. Calls are 20 cents a minute.
Now, for many of us... we're deaf users. The calls feature isn't really something many of us care for. Secondly, text messaging is used for contacting OGO users and cell phone users. If you are deaf, but have hearing family members who use cell phone... text messaging is the way to go. Also, Ogo pagers are slow with receiving e-mails (e-mails refresh every 5 minutes)... but they do get text messages instantly. Blackberry is better... for voice users. Sidekick is better for those who aren't looking for fancy features and non-voice users.
Think of it like the Playstation 2 and Xbox. Both can play games and DVDs. However, the Playstation 2 was created first. It wasn't made for constant DVD use. The Xbox came next and it can handle constant DVD use.
Back to the Blackberry and Sidekick. Both can handle voice calls. However, the Sidekick was created forst. It wasn't made for constant voice calls. The Blackberry came next and it can handle constant voice calls.
Of course, this is all just my opinion and also opinions from my friends who are Sidekick and Blackbery users.