"The Titan is too big, especially with such a low screen resolution."
Of all the problems the Titan has had, the low screen resolution ended up being a non-issue. You have to pinch-to-zoom to stupid levels for the screen res to become a problem, and the large screen pretty much prevents that.
Also, the 4.7" Titan is really only a smidge bigger than my Focus S with the 4.3" and extremely comparable to the 900.
Titan - H- 5.18", Width- 2.78", Thickness- .39", weight- 5.64 oz.
900- H- 5.03", Width- 2.63", Thickness- .33", weight- 5.64 oz
"S"- H- 4.96", Width- 2.63", Thickness- .33", weight- 3.90 oz
So, if size is really a factor, and if you do not want a large heavy phone, neither the T2 or the 900 will be a good choice. If you like a little heft and girth in your device, than they both will work for you. The 4.7" screen is absorbed really well by the HTC design, which I think is outstanding.
Really, it comes down to three things:
1) Price- Advantage 900.
2) Support- Advantage 900, but I bet HTC supports the T2 well. Just Nokia will support better.
3) Perfromance- TBD.