For bronze, my choice would be a Nickel Aluminum Bronze or even better would be monel. NiAlBronze was especially developed for the USNavy for resistance to sea water in submarine service.
However, (never ending story) unless the bronze or other metal can be traced or is accompanied by mill certifications for chemicals and physicals, all bets are off with regard to its physical properties unless you send out a test coupon to a mechanics lab. A lot of 'schlock' is being imported into the USA, especially the bronzes.
Stainless is still a good economical metal to use on boats .... just design it for 30,000 psi if its cyclically loaded, and polish the hell out of it - thats whats being done in the chemical process industry.
Titanium has better corrosion resistance but still has a fatigue limit of ~0.4 of Ultimate tensile strength (Stainless @ .3 UTS) but its a bitch to machine, etc.

OEM designs especially on older boats were seemingly designed to ductile (ultimate tensile) values, and ignored fatigue limits ... or 'fatigue' was an afterthought included within the generic structural safety factor applied. Hell you can use just about any material - bricks, rubber bands, etc. and still do a reasonable job, if you understand 'fatigue endurance limit'. Its NOT the material per se thats important; rather, it the understanding of the complexities and anomalies that 'concentrate' the stress and propagate fatigue and weaken the structure that's important.

I say again the newer Beneteaus with their 'T-bolted chainplate rod system' is perhaps the most simply elegant, economical and pure stress (absence of stress anomalies) design, I believe, is where replacements, etc. should be patterned after ... not pierced chainplates with kinks and bends and surface roughness galore.