Help decide Watch to buy for 1st unborn son and will pass to him later on

[koolkas]

I'm expecting the birth of my first child this Nov, I plan to buy explorer 1 for later on pass to him 18 years later.. since Rolex sport now are hard to obtain, any idea of what model? Currently I owned subs ceramic date, Tudor BB ETA, and omega speedy chocolate dial... But looking at the new root beer..wow birth year also...but maybe need to wait how many years. ...