IMHO A306/310 are technically complex indeed, but this is also true for A320/340 (A350/380 as well I assume, but didn't have the joy to fly). The main difference is the ECAM. It's very basic. So for many abnormals you have to revert to paper checklists, QRH. In addition the manuals were kind of confusing. Mainly a translation problem. From French to German and then to English. Anyhow, I loved it.