human
No specific role has been assigned or defined for the CF-18 replacement but it's likely a multi-role airplane would be ideal. Rafale and Eurofighter are fairly similar in design.  Rafale's radar and aerodynamic design gives it an edge in terms of loading, intercept capability and detection. Eurofighter is the better air to air performer in terms of range, weapons and handling at high speed.  Russian models are a non-starter due to parts availability, NATO interoperability issues and many other reasons.  An American model such as F-18 or F-35 provides both state of the art performance plus much simpler logistics which is why Canada typically buys American. 

It's worth considering that any potential sale means substantial technology transfer to Bombardier who will certainly be asked to participate in some capacity.  For Boeing and some other bidders, that means deciding if the contract is worth giving away proprietary information to a potential competitor.
gpt
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