Submariner Differences over the years ..

[Bazil]

My first Rolex - i’m down on ‘the list’ for a TT Sub blue dial (bluesy) this is about as good as it gets for me and the look is completely what I’m after.
Very new to Rolex I’d appreciate to gain peoples knowledge on the subtle differences that have occurred over the years with each model.
I did read about the 1999 version Swiss Only that the dial will patina to purple that sounds pretty incredible to me …
I’d after knowledge along the lines of the differences in bezels , subtle tweaks that have been made , colouration on the dials all that Jazz please so I can gain an understanding of maybe what year I’d like to go for the most ..
I appreciate your help on this matter folks ..