Beechcraft King Air 360 Er vs Bell 525 Relentless vs Piaggio Avanti Evo vs Piper M600 Sls

The Beechcraft King Air 360ER and Piaggio Avanti EVO are both pressurized, twin‑engine turboprop fixed‑wing aircraft aimed at efficient regional travel, while the Piper M600 SLS is a simpler, pressurized single‑engine turboprop for shorter, lighter missions. The Bell 525 Relentless is in a different category entirely: a large, long‑range twin‑engine helicopter optimized for point‑to‑point access where runways are impractical. On range, the King Air 360ER is typically the longest‑legged of these fixed‑wing options, designed specifically for extended endurance. The Avanti EVO also offers long range for a turboprop and is often chosen for speed‑and‑efficiency over regional to mid‑range trips. The M600 SLS generally has the shortest range of the group, suited to personal and small‑business missions rather than maximum legs. The Bell 525’s range is strong for a helicopter, but it usually trails comparable fixed‑wing turboprops on distance efficiency. For passenger capacity, the King Air 360ER commonly seats the most among the airplanes (often up to about 9), the Avanti EVO is typically configured around 7–9, the M600 SLS around 5–6, and the Bell 525 is commonly arranged for roughly 12–16 depending on layout.