Originally posted by ltcoljt
Moving to the hilltop greatly increases the chance of finding some shielded grassland which is badly needed to use that possible wheat to its best advantage. It appears that for the three mystery tiles to the northeast we will be moving to, we are giving up three tiles that produce only a piddly sum of two shield naturally.
You're giving up five tiles: hill, forest, plains, desert/incense, flood plains. That's 5 to 8 shields, although admittedly on mostly unfavorable terrain.
The desert/incense isn't likely to be worked soon, but effectively it's worth 1+ gold/turn just to have it within your borders, until you can hook it up another way, since the luxury will reduce your need for entertainment.
If there is wheat available, then I don't think, with 3 forests in range of the start location (including one immediately available to work), the grassland/shield is that critical, although it would certainly be nice. It's going to be quite a while before your worker can mine the grassland (assuming you want to irrigate the wheat first, which seems a higher priority, and then perhaps build some roads), and until then it's not significantly better than a forest. Especially since I'm going to want to keep my capital small (to avoid the threat, or minimize the damage, from disease).
On the other hand, if there's no wheat or other bonuses, then getting grassland/shield is pretty important, and there's unlikely to be a higher priority than heading over to improve it. But in that case, moving the worker onto the hill first, and then the settler, does no harm, because the worker is going that way anyway (although roading the start tile and then moving two spaces on turn 4 is also reasonable).