Indiansmoke
Deity
My preference is based on assuming fastest REX strategy is what we are still aiming for. Settler is available 3-4 turns earlier and has the needed escorts. Disadvantage is that the 3rd strong tile is developed later (though at t47 its only getting used in scenario 1).
Your scenarios have advantage if we judge that settling city 2 asap is not optimum for our overall goals. Basically, your scenarios give either more beakers, more pop, or more production depending on which goal we see as more valuable, at expense of settling city2 3-4 turns later.
I like your scenario which has the strong tile (mine) being utilized better than my scenario. Not sure whether using the hammers in the forests or saving them for later is optimum. Using them pre-math, earlier is probably stronger.
If you try it on the last test save I uploaded you will see whether having copper included changes anything in your scenarios. It is possible that Phoenix Rising settled somewhere else, actually.
But like I said, deciding between the different options here will be easier if we first decide what the priority is. But maybe one scenario is best for all objectives; if so please explain.
Having copper definatelly changes things, not sure it gives 1 turn or not though.
However the scenario of 2 pop slaving settler and staying 1 worker is bad in principle.
In my scenario 3 you can get settler faster if you chop and not improve silver.
So scenario 3 is the way to for fast REX...although I need to be seriously convinced that we need settler that much faster to give up scenario 1.