Rebooting to a different OEM / airframe system has got to have significant points in its favor to do so. Hard sell to make with your environmental conditions.
Pose this question to you and any others interested in responding. What if you did not have to justify a switch ...that you were doing a new startup with no other similar OEM models operating in your region with an ISA+20 to deal with year round and you needed max possible payload?. Where would you lean, 109/135/429/145?