Epic 4G/Galaxy S Pro will have a HW keyboard. The latter will be GSM.

Now, with that bit out of the way; N900 pales in comparison in all but OS. I've had a Galaxy S (derivative) and it's hands down faster, better camera (yep, I went there) and just downright feels like a more complete, less buggy phone.

The battery life is the biggest downer - I use Zomut's Watchdog to mitigate most of that problem - and the Super AMOLED is honestly very readable/usable in direct sunlight. In fact, I'd say it's better than the N900 in that area too.

GPS on the Galaxy S is a current problem. I've tried every fix... none of them are "perfect". I personally get a lock that's usually within a block of me, usually on top of where I'm at... and real fast. But I've had incidents where it was nowhere near me - half km off. While in Pittsburgh earlier this year, the N900 underperformed in that area in a huge way where the GPS would take 4-5 minutes to locate me, and it was not always accurate whereas my iPhone 3GS was more accurate and fast, but still failed in certain downtown areas (Pittsburgh and Philadelphia).

I've used both very recently, and I give the edge to the Galaxy S phone - screen, speed, processor, lack of microUSB falling out (so far) and apps that I actually use that do not bomb out on me - ok, slight exaggeration, I've had some apps force close on me.

But honestly... people will/should choose what's best for them. I just found the Galaxy S to be closer to what I was looking for than the N900. Both are great pieces of kit, Samsung has the edge in a lot of areas imho.