I've mostly used a UP2 valve and have had excellent results when using high quality door cylinders and retracts. However, when using lesser quality cylinders/retracts, leaks in the cylinders can prevent the backpressure buildup required to shift the spool valve in the UP. As such, I'd be inclined to go with the two valves/servos and a sequencer. As CraigG said, having the ability to manually move the valves for access/troubleshooting/maintenance is handy.

Regards,

Jim