Well, in fifty years, maybe they will become collectible. Since then if you want something collectible as a Submariner, go for some early Sub, from Tudor or Rolex.
Something like this: Or this, Or this... This, too... Or this... ...
"Better for collecting" Uh oh... Sounds very similar to "better for investment"
Nobody has a crystal ball... Whenever you ask someone to predict the future, you are only dealing with opinions and not facts...