i have the izzo alex dueto and can vouch for its excellent construction internally and externally. but if you make latte more than espresso you may find the vibiemme has greater clearance on the group head than the izzo ( a definite plus IMHO)
also operate the lever on both - i have used some where the action feels like a korean car compared to a euro.
ask to have a look inside both machines - this may give you a better feel for the value for money on both.
In any event as a first machine both would be great and it will get down to your preference of aesthetics and design.
you should probably also include the expobar minore IV in your evaluations.
good luck and keep us posted!*