Whats the best one?

4.2.1.102 / 4.2.1.66 seems a bit buggy.

I wanted to update my tmobile phone to the latest rim software but tmobile does not support the software they say.If there is a problem with my phone there will be nothing they can do they say.

Well the TIM has many more features so that is what I am using. It has a few bugs but they don't bother me much.

I'm enjoying the latest OS as well, but .71 was great with no bugs that I know of if you still want to downgrade.

Using Telstra v.4.2.1.66 (I belived English and Chinese only). I'm in US and only needed English, this will save me more space for other software on my Pearl

It's the same as TIM and has more language support (multi-language)