Beechcraft King Air 360 Er vs Bell 525 Relentless vs Cessna 208b Grand Caravan Ex vs Robinson R66

The Beechcraft King Air 360ER and the Cessna 208B Grand Caravan EX are fixed‑wing turboprops, while the Bell 525 Relentless and Robinson R66 are helicopters. In range, the King Air 360ER is generally the longest‑leg option of the group, suited to longer regional missions; the Grand Caravan EX typically offers solid but shorter regional range than the 360ER. The Bell 525, designed as a long‑range, high‑speed helicopter, can cover substantial distances for a rotorcraft but is usually less range‑capable than long‑range turboprops; the Robinson R66 has the shortest range, aimed at shorter utility and transport flights. For passenger capacity, the Bell 525 and King Air 360ER commonly support executive configurations around 8–11 passengers (depending on interior and mission equipment), the Grand Caravan EX can be configured for up to about 9 passengers in typical commuter/executive layouts, and the Robinson R66 is a smaller helicopter typically carrying 4 passengers plus a pilot. Overall, the 360ER emphasizes speed and range, the 525 emphasizes premium rotorcraft capability and cabin, the Caravan emphasizes rugged utility, and the R66 emphasizes simplicity and lower operating scale.