I have the Overland Airbus package, and one thing to keep in mind is they are basically just as complex as the default flight simulator aircraft. They look nice, and there are tons of addon liveries for them, but the complexity is not there, if that is what you are seeking.
I am not familiar with the Wilco offering.
I agree on the overland thing. The planes are very similar to FS planes: no FMC and complex buttons and switches. Anything Wilco you can expect to be modelled well, great paints, FMC, complicated panels, and a big hit on frames.
In short:
Wilco- More real.
Overland- Easier, but quality of model just as good.