I found the following features useful in my citizen skyhawk (old model not navihawk)
Stainless Steel (no sweaty rists)
Backlight.
Two alarms for those early reports.
UTC and 2 time zones (eg home and new destination)
A prominent digital display for an exact instant time for paperwork
But an analogue gauge just gives me a better overall picture when on a turnaround.
Stop watch for those things that you just wouldn't think of.
And finaly the slide rule....... one it can be an ice breaker "hay interesting watch you got there"
Or for those bar aviation conversations when you haven't memorised every conversion factor in the world and you want to explain how much fuel a chipmunk holds or how fast something goes in MPH.
The slide rule is a tiny bit poncey but since i dont have the 80's top gun Ray Bans i think im allowed this consession.