14060 or 14060m?

[bigwatchman]

Hello all. Well my dream of owning a Submariner is off and running now. Once I sell my two other watches, I should hve more than enough for a 14060, one of my grails. Now the question is, which model 14060? I like the look of the two line version but several have eluded to the good upgrades with the new movement, but of course that changes it to a four line sub. If it is truly better, I could learn to like the four line version of this watch, but need to know more about it. If anyone could help me out on the differences between the two, I will thank you in advnce.