F-35C can refuel from Canada's CC-150T and CC-130 tankers, which F-35A cannot unless Canada wants to be raped by LM to pay for a probe-equipped F-35A and no doubt the associated R&D + OT&E costs....
F-35C also carries more fuel than the -A model - and the tailhook would be quite useful if landing on some contaminated short RW somewhere north of Buttfuk-middle-of-nowhere-Saskatchewan?