If e-mail for your corporate requirement is primary, then BB is it. It is the only reason my wife has to have BB. Her company requires it. When she has problems with it, I absolutely hate dealing with that awkward interface to fix it.
If your job doesn't require BB, then I would avoid it like the plague.
I chose the TP2 at first because of Digiblur's recommendation and I must say he was right on target. I'm not sure what you mean by sluggish but the screen updates on mine is like greased lightning. It just flies. We're you referring to web page downloads? That casn be slow at times if your internet connection is bogged down. Another thing is when you double tap the screen or use the screen zoom slider, it first zooms to a blurry screen and thenm updates to a refocus. This takes 1- 1.5 seconds. In a scroll down the applications page or other fully downloaded web pages the scroll is quite smooth and very fast. Compared to the Droid everyone raves about, the Droid is not as smooth and hesitates as the zoom feature or pan feature is used. I haven't tried custom roms yet. From the reviews, I haven't found anything compelling to make me want to switch but I keep looking. It certainly isn't speed and the GUI is not that different that I have seen.
But is the TP2 for you?
If you want more than just a phone and e-mail. The TP2 is about the bets thing I have seen to date.
1. Multitasking- Listen to a podcast or music while surfing the net and downloading in the background, then a phone call comes in and the podcast is suspended while you take the call, then when you finish the call you are automatically returned to the podcast, all while relaying the sound to your BT headset. Or run your GPS navigation while listening to a podcast via BT.
2. Sling your video from home.
3. Operate your computer with remote desktop.
4. Send a document or web page to your laser printer via wifi connection.
5. Tether the EVDO Rev A at 1.5 Mbs to your laptop or desk top.
6. Track pictures with your GPS.
7. Play pinball, chess, checkers, pool and a ton of other games while listening to podcasts.
Plus tons more, if stuff like this fascinates you and you want to do it, the TP2 is for you.
Oh did I mention you can hard wire it to a TV set and get everything, sound too, on a large screen TV. In a hotel room most hotel TV's have A/V inputs these days. just plug the TP2 into your hotel TV and sling your home content to the TV. It's amazingly good resolution.
Most of this stuff you can't do with a BB, I-phone, or even the Droid (yet).