I have owned both. The B50 is gone and the Aerospace 42mm (Previous Model before the EVO) has stayed with me as my de facto travel watch.
I had the B50 Night Mission and while the watch had many positive aspects to it like the battery charging capability and myriad of functions, I can not recommend it.
Too big and thick on the wrist. Yes it is beautifully finished and constructed in titanium but it is still a sized like a hockey puck. The long term reliability of the so called In-house movement which in reality was sourced from Soprod, is still a big question mark.
I had timing problems with mine, it would not keep time within the promised -/+ 15 seconds a year. The watch kept losing time for no apparent reason. The watch went back to BUSA five times and they kept telling me it was well within COSC parameters for superquartz watches which was one giant bowl of BS.
At the end they told the movement could not be regulated!!! Unacceptable on a watch that retails for $8K!!!!
Did I mention how lousy is the resale value of the B50 and these very expensive quartz models? I almost could not give it away and it was practically in mint condition. Ended up selling it to an independent jeweler and lost some cash in the process but was relieved to see it go.
The watch soured me on the whole Breitling ownership experience which has very positive with other quartz pieces until then.
In my opinion, don’t waste your money on expensive quartz. You are better off flushing your hard earned cash down the toilet. Fancy quartz is a hard sell. At those prices you are competing head to head with more sought after mechanical watches. Personally, I would never spend more than $2500-$3000 on a new high end quartz piece.
The warranty of only 2 years is lousy too, considering the expectation of expensive repair and replacement costs down the road.
On the other hand, I kept my trusty ETA based Aerospace. Watch keeps time well within Breitling promised accuracy standard of 15 seconds a year. Mine is within 7 seconds a year. Doesn’t have all the bells and whistles of the B50 but guess what? It is a far nicer looking watch, sits great on the wrist, is reliable, any competent watchmaker can service it and it has all the functions that you would ever need or want. Did I mention how ridiculously comfy it is?
I highly recommend the Aerospace. Here is mine:
After I dumped the B50, I replaced it with a brand new Rolex Milgauss GV Z-Blue... No regrets!!
I know, totally different beast from the B50
But love it. I had been wanting to scratch the Rolex itch for a long time and the lousy experience with B50 is what pushed me over the proverbial edge to get the Milgauss.