Most pilots watches are now manufactured with either stainless steel or titanium. Which, you may ask, is best?
There are several factors to consider here:
Titanium or Stainless steel
Price: In general a titanium pilot watch
is more expensive
Durability: titanium is more durable than stainless steel, however titanium is more prone to crack under extreme use. Additionally, a stainless steel case watch can be repaired, whereas a titanium case cannot.
Weight: titanium is lighter than stainless steel.
Appearance: The natural colour of titanium is dull gray. Stainless steel cases are normally silver, however they can be plated with gold. Titanium watches cannot be plated.
Scratch resistance: Titanium watches will scratch easily whereas stainless steel scratches can be buffed out and removed.
Corrosion resistance: It is claimed that titanium shows better corrsion resistance than stainless steel.
In the final analysis, the titanium watch wins out on durabilty, weight and corrosion resistance, but stainless steel wins on price and scratch resistance. It also has the advantage of being repairable. The choice is ultimately up to you.
My personal choice was stainless steel. I chose an aviators watch that is available in both stainless and titanium (Citizen eco drive skyhawk) mainly for the look, and feel of the stainless steel. Also, after wearing this stainless steel watch in salt water for years, it has shown no sign of corrosion at all.