I dont know if you could call it harder but a Jabiru is certainly a handful in marginal conditions. Very rarely would you go from full left to full right deflection in a warrior... every day ocourance in a Jabiru. Hard eh; scary... defintely!
More to do with being extremely unstable in wind because of their weight. I dont know how anyone navs in them, they're so cramped and you feel every bump. They'd be a total nightmare in summer!