Budget wise they shouldn't be too far apart, the baseline Seamaster would cost a bit more than the Tudor (not sure if u mean BB or BB 58) n I think if u r considering between the 2, it isn't an issue. I guess whats left is aesthetics and specs la. Start by going to AD n try them out. Which piece in particular really appeals to u, look at specs, look at possible maintenance cost n interval, power reserve etc. The seamaster has a clear case back, which displays its nicely finished 8800 cal movement which is a plus point vs the BB. Go to AD and try bro, thats ur best bet. u might find one to sit more comfortably than the other, or a bit thicker than the other, or some other factor that would ultimately clinch the deal. I would advise for these level of watches, get the ss bracelet option la better, then u can opt for the strap if u want. Makes it more sellable in the future when u decide to free up ur watchbox for another piece.