There are two separate forums.
The support one is not opened for anyone and is much more mananged than this one in terms of who gets in and posts being monitored - as far as I know.
I might be wrong but discussions on the support forum are related to tips and tricks from the support team + generic discussions. You'll find more support guys on the support forum for sure.
Other than that, I have seen similar posts in both forums. It is also more likely to find more OO RnD people on the practitioners forum instead on the support one.
My conclusion: It is good to be subscribed on both.
Hope it helps,