I do not know thw ominia2 but HD mini is a very nice phone.
- It works well and is very stable. No need to restart every day such other.
- Very responsive in regards to Diamond and Diamond2
- The size is perfect. Diamond had a too small screen, HD2 do not fit in the pocket. The HD mini fit just well in the front pocets of the gean's.
- Most of legacy such (tom tom Collins dic) run fine
- Most of new apps such (need for speed) run fine
- Screen is scrach resistant
- Some new apps not, such SlideIT, I hope the next version.... because of special HVGA screen resolution
- It does not have front camera. (I never used it but...)
- Screen is scrach resistant but the front glas is not unbreackable. If the phone fall on concrete or ceramic.... shbriiik the glas explode. (i tested for you)
- No electronic compas like HD2, shame, it would be usefull
I do not see other defaults, I like it realy very much.
Hope it helps