I believe the 728 will be more successful, given the fact that a "real" business class can be installed due to the cabin width. A second advantage could be the possibility to offer a convertible derivate of the 928 which increases the earning potential airlines have. Cruise speed is not so much an issue in Europe and the US East Coast, it will only pay off on longer segements.
A problem could be the price tag which is - as far as I know - a bit higher than the Embraer´s and the missing LCY-capability.
There are three things I would improve:
- decide on the second 728 derivate as soon as possible, I would favour the 528, the 1128 could come at a later stage if customers demand it. The 528 would be better suited for todays needs, there are several airlines which have not yet decided on a 50/55-seater (Cimber Air, SAS Communter, CSA).
- give the 728 the capability to operate out of LCY - a good sales argument in Europe
- develop a "rough-terrain" 928-200 which is capabale to operate from less developed airports/fields (I think the ultimate choice for a number of afircan airlines would be a "rough-terrain 928-200 Combi")
FlagshipAZ, thanks for the flowers (as we say in Germany)!