Adding my personal opinion here,
Note that I dont own any watch from any of the 2 brands.
1. Brand Value,
Corum - Based on my perception, Corum does feel more premium than B&R
2. Looks/Style
Corum - As both are unique in design, I would vote for Corum here as they are Rarer to sight and the colorful flags made it good for both formal and casual.
3. Resale
B&R of course..
Regards,
Dex