The advantage with Fusion is that you can control what elements are exposed to the neutron flux and so control what sort of new elements or isotopes you get. For instance there's basically nothing in the air except for dust that will absorb a neutron and turn into something you have to worry about. And part of the design of a fusion reactor is to use lithium to absorb as many neutrons as possible to breed tritium to feed back into the reaction.
By contrast the byproducts of a fission reaction are set by the fuels used and include really nasty stuff like Strontium-90 and so on. But even fission plants are designed so that the radioactive byproducts are essentially all spent fuel or things contaminated by spent fuel. Neutron activation is a design consideration rather than a source of waste.
Of course the neutron flux will tend to enbrittle the metals used in it's construction which will have the effect of increasing maintenance costs.
By contrast the byproducts of a fission reaction are set by the fuels used and include really nasty stuff like Strontium-90 and so on. But even fission plants are designed so that the radioactive byproducts are essentially all spent fuel or things contaminated by spent fuel. Neutron activation is a design consideration rather than a source of waste.
Of course the neutron flux will tend to enbrittle the metals used in it's construction which will have the effect of increasing maintenance costs.