Young Sir
As one with many years of folly behind me, and having spent thousands of dollars on expensive watches (make that MANY thousands) the one thing I can say, if you have two watches you'll never be sure of what time it is?
While I was a real Rolex fan for decades, they are just a Texas Timex and way overpriced. Tried different brands and found them to be just a time piece. Tag Hueur, Omega, Bulova, et al.
With my old eyes, I have been wearing the LumiNox for the past 10 years of so and been happy with my latest one. Got it for $100 on Ebay about 5 years ago and I suspect will need a battery soon. If I lose it, hell it has only been about $20 per year, marvelous timekeeping, easy to read especially in subdued light. I'm not a fan of the hinky SEAL watchband but it is durable and that matters more than the image.
As for the aviation functions, you'll learn to do them in your head fast enough for practical use. Fuel burns, ETE's, etc. Comes with time and experience/exposure.
Don't spend a lot of money for somethiing that tells time! Well, on the other hand, its YOUR money and you spend it any way you like!
Semper Fi
Rocky in Uganda