I think they both do rear racks and can take tyres at least 28-32mm

The coda gearing is gentler, much easier for hills. It would be better for carrying shopping etc if that is what you want it for.

The blade sport is a bit sportier, on the down side this means less gear range for hills. Yeah aluminium will give a harsher ride but on the other hand will be marginally lighter (the coda steel is good quality).

Which feels nicer to ride? Do you want it for commuting/shopping or for road and bike path riding?

Avantis are available heaps of places, similar ride from bikes like Merida and Norco and Specialized. Shop around and look at other flat bar road bikes if the price is the only issue.

Also, Avanti makes the Sub Zero and Blade bikes which are nice (even sportier if that's what you want) as long as you don't want to carry heavy loads.