I try to answer what I can here. Electric ovens need no venting (codes very by city) I see mostly Electric ovens most of the time. One reason is they can be put in a base cabinet away from a cook top/ no sense in standing in front of a screaming hot oven when using the burners on the cook top. If changing from Gas to Electric things to think about; is the gas line in the way? do I have to run new electric circuits for the new Electric oven? And reverse if going the other way Electric to Gas. Some of the euro models have special needs as far as electrical supply. Is it going to fit in my cabinetry or will It need modification.
Bosch is a good brand along with others on the market.
My personal feelings, electric will give a even cooking temperature/ a good thing... Gas will get hotter faster and recover faster. This is my opinion only! I like Gas. But most of the high end kitchens I have done use Electric Ovens...
Ditto what Maynard said and Myrtle said
note; shop around there are some great deals out there.