pros and cons on were to mount the string bracket on neck ?

Welcome Mike!

I place it based on which design I'm copying.

If the guitar is 50s style, place it where Leo put them first.

If the guitar is modeled after a more recent design, use the Strat location.

 

+1. Just depends on the vintage vibe you want. Early to mid 50s style round string trees are usually drilled between the G and D tuner post. Later T-style trees usually in the strat position. I've heard people make arguments regarding relative merits vis-a-vis intonation and tuning stability, but I think the differences are probably minor or non-existent.

 

If you're shootin' for originality just pound a nail in there anywhere and bend it over a little.

 

I like the string tree location on my parts tele better than fender strat. It is a bit further so behind the nut bend is easier.

 

Here's a left field one.....

No string tree, Eric Johnson doesn't have them on his strats......

I did one strat build with no string tree, no noticeable disadvantage by not having one....still works great.

 

One of my strats has no tree. No problems

But if you want one on it I would go for the vintage position.