Over the years I have flown most every model from the 7AC through the 8KCABs and after a few flights in various airplanes I settled on a newer (1997) Super Decathlon (its not for sale). As Jerry said all of them are very honest flying airplanes and make good trainers. The main reason I went with the 8KCAB over a 7 series was the stronger airframe/wings of the Decathlon. I felt the extra safety margin while doing aerobatics was worth the extra cost.
All models are comfortable on cross country flights and I’ve flown multiple 3+ hr legs in the Decathlon without any issues. In smooth air and trimmed out, it flies hands off very nicely. On a recent cross county flight to Texas, occasional light pressures on the rudder was plenty to keep it pointed where I wanted to go (in truth, I was too busy playing with my new Garmin 396 to spend much time with my hand on the stick
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). I actually prefer to fly my Super D cross country over the local club’s Cherokee 180 and Cessna when the weather is VFR. I have more room to move around, can see so much better, and it’s a bit faster than both. One potential draw back of the 8KCAB is most/all are not IFR certified, where as I think most Citabrias can be setup for IFR flight.
Operating expenses are probably a bit lower with the Citabria since your fuel burn would be less (unless you get a new one with the 180hp), but I have no idea if there are any differences in the insurance costs. The other area the Citabrias generally have the advantage is useful load, but the longer steel or aluminum gear for the Decathlons help with this in Normal category operations if you have the metal spar wings.
All of the models handle crosswinds very well, IF you use the proper techniques. Landing distances are similar for all of them and can get you into virtually any strip with ease. Pilot technique and airspeed control is the key if you need short takeoff and landing distances (a bigger factor than flaps/no-flaps for the average pilot IMHO).