If in doubt then go with Fractal, it's known to give good results most of the time. Also i guess it's the script the AI was most thoroughly tested with.
I'd put Highlands into unusual (i don't like it all that much
)
If you pick it, consider putting "Watter Setting" to "Large Lakes" or "Seas", which i find gives nicer result.
Archipelago i found gives quite different results depending on what you set for "Landmass Type" [archipelago / snaky continents], maybe make a distinction here.
"Medium & small" seems comparable to"Hemispheres". So you could maybe use that one too once you run out of scripts to use.
Arboria doesn't look that unusual, a pangea variant with more straight coastlines.
Islands in it's default setting i think will give each player their own, isolated, island.
Lakes i think you should include in the unusual category. Does seem to generate some nice looking maps.
"Shuffle" is just one of (pangea / fractal / continents / archip) at random. (Says so in the map-selection when you start the game via "Play Now")
Based on my quick impressions, map script groups based on type of landmass created:
Water heavy maps
Archipelago
Archipelago - snaky continents.
Fractal (sea level med or high)
Big&Small (one bigger landmass, lots of smaller ones mostly connected together)
Tiltet Axis (this seems interesting. Instead of East/West you have a North/South passage)
Islands (each player gets his own isolated start)
Pangea type maps
Pangaea
Arboria
Global Highlands, (pangea with more mountain ranges)
Fractal with sea level low, (gives more snaky versions of pangea. Sometimes gives isolated isle / continent)
Continent maps
Custom Continents (Result is more random and varied than Continents)
Continents (2 big continents with some small islands maybe. Maybe should put this into Hemispheres Category)
Tectonics (basic; Mediterranean is "unusual")
Hemispheres (divides world into x large continents/island groups)
Medium&Small
Mirror - (wide continents, snaky continents, archipelago)
(you'll get two "hemispheres" which are the mirror images of each other)
just a lot of land, no surrounding sea
Great Plains
Highlands
Lakes -- has water mixed in --
Rainforest -- similar to lakes, but with lots of jungle
Boreal -- similar to lakes, but lots of tundra
give earth like continent config (eurasia / america)
Terra
Earth 2
Land is on a ring around the edge of map
Inland Sea
Tectonics (Mediterranean variant)
Ring
Oasis -- similar to the "ring" maps, desert instead of water in the middle -