well, you make one mistake in leaving 'hardware acceleration' under MTF, as QML can also be hardware accelerated (as can QWidget), and likewise, MeeGo Touch can use software rendering, so there's no functional difference between the three there.

personally, the summary, as i'd put it, is below.

summary being (as it ended out being a bit longer than I expected), with no surprises:
- QWidget is portable, but aging badly
- QML is shiny, new, and looking promising, but really needs more work in the portability department with e.g. components (no, mobiles really aren't the only target in the world, no matter what you say, Nokia) - which is something I myself have started playing with in the past day
- MeeGo Touch is an 'ok' choice if you want a good product on MeeGo now and don't care about maintaining it into the future or making the best technology choice for deployment on multiple platforms.

The comparison:
QWidget
(note, that it isn't deprecated from the Qt point of view as there is no capable replacement yet, but it clearly isn't where UIs of the future are coming from)
Pros:
- Cross platform
- Native look and feel
Cons:
- Not really flexible enough to do some of the shinier UI tricks
- Painting stuff yourself is really a pain in the ***, especially when you get on to things like delegates

QML
Pros:
- Cross platform
- Flexible
Cons:
- No native look and feel
- Immature
- QML (with Qt Components)
Same as QML, with the addition:
Pros:
- Some native look and feel, but only on limited platforms at this point.


MeeGo Touch
Pros:
- Designed for Omg! Shiny!
- Fairly mature, thanks to having had a number of applications built on it
Cons:
- A very, very moving target - I don't think the API was all that well thought out in places (seriously. MContentItem, MBasicListItem, MAdvancedListItem, MDetailedListItem?! how many different ways do we *really* need to show data in a list..), nor the requirements, and it shows in the sheer amount of stuff that is deprecated from MeeGo Touch, even in more recent times.
- No look and feel for platforms other than MeeGo whatsoever
- Increasingly less portable (things like MGConfItem, in addition to being kind of crappy design, are kind of hinting where the target platform is)