Well, I suppose it depends if the airplane you will fly actually has XLR connectors or not, the Airbuses tend to, the Boeings usually have twin plugs (the widebodies may either or both - depends what the company ordered)... When I bought my A20 it was simple, I flew the 737 (that had twin plugs) and occasionally various GA types, the 777s i fly now either have both, or just an XLR connector - so I bought the cheap adapter. Just to get the XLR version in the hopes that your future type will have (powered) XLR connectors doesn't make too much sense to me.