... is just a matter of personal taste, be it the models you are dealing with or any other model.
Both have a completely different character: one looks stealthy and military oriented, the other tries to aproximately replicate a classic model of the past, even in the dial tropical change some watches suffered.
So you may receive many different answers depending in the taste of whom answers you. (If you want to know my own taste, I would chose the 663)
But I feel that the only one who has the definitive answer is you!
Cheers! Abel