No OS wars here... I can tell you that I am an avid user of both OS's. S60, on the E70, is an extrememly powerful OS; I will say that it is more powerful than BB OS. I will go nose to nose with anyone who says otherwise. That doesn't mean that S60 is better, but just as I said more powerful. It is quite literally a multimedia computer in your pocket; whether it be any S60 device. That power also adds complexity so some people are more charmed by the simple OS of BB vs. S60. I for one needed more power so I am not a very happy owner of my Nokia N70.
The E70 is certainly larger compared to the 8100; not huge, but much bigger. It however could virtually replace a laptop for extended periods of time. BB's I still feel are messaging devices... as is the E70. But the E70, again, adds everything a S60 has to offer.
The 8100, with the same OS as other BB's, will have a slightly better experience with Push Email. Yes, the E70 does have BB Connect, but it, from what I hear, is not quite a fluid as the rest of the messaging apps on S60 so perhaps a BB user might be turned off buy that.
In the end, in my opinion, these words describe these devices.
E70: Powerful multimedia computer
8100: Light, clean, and simple, messager with multimedia functions
I somedays miss my Blackberry but to each his own. Some will be happier with a BB and some with a S60 device.
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