I've had them both (still have actually :lol: ), and to be honest, I can't decide which one to sell.
The Tornado is a great phone, and with the most recent firmware, quite bug free, and almost all software works without a hitch. I personally don't really use the wireless but GPRS works well. The only problem with the Tornado is that it's, IMHO, looking a little dated, and is also a bit plastic-y.
The Mteor is a great phone- it's one of those phones that you pick up and think "this feels nice" (bear in mind I'm someone who bought a Nokia 8800). Mostly it works really well, but there are a few teething issues- TomTom does not work perfectly, sometimes calls go thru to voicemail when there's a good signal, the battery life can be quite poor and I find the jogdial a bit irritating (when the phone rings, rocking the jog dial silences the call, so sometime I only get short rings when the phone is in my pocket). However, I like the quality of the phone (all metal construction, no squeeks, I think it looks good).
So overall, the Tornado- good, works well, genuine quad band (and I travel to the US a lot), wifi may be a bonus, lots of users (and hence support), but does not feel like a quality luxury phone. The Mteor- 3G is nice for data (but no vid calling), a bit buggy, but feels like a luxury, professional phone.
To be honest, I'll probably keep the Mteor- it plays music with better quality than the Tornado, plays my videos well, and Tomtom works well enough (just goes silent every so often).
Hope this helps you make your decision