LCD is much harder to reader, and a lot more complex to drive. Vibration wise I'd take potted 7-segment display as well. Single color is a benefit. OLED would

LCD is much harder to reader, and a lot more complex to drive. Vibration wise I'd take potted 7-segment display as well. Single color is a benefit. OLED would have much shorter life, along with burn in - 7 segment ones tend to display very static info in many cases.