Currently is the planet class the same for all races, what is a good world for 1 race is a good world for all races. But I would suggest to let different races prefer different kinds of planets.
An example of how this could work:
All habitable(8+ base planet class) planets have different ratings for their most important characteristics, like
|
Temperature
|
Cold
|
Moderate
|
Warm
|
|
Water
|
Archipelago
|
Continents
|
Inland Sea
|
|
Size
|
Small
|
Moderate
|
Big
|
|
Atmosphere
|
Thin
|
Moderate
|
Thick
|
Each race has for each of the above characteristics one options they like(+1 planet class), one options they hate(-1 planet class) and one option they tolerate(+0 planet class)
For example:
Torians love Moderate temperature Archipelago Big planets with Moderate Atmosphere
Torians hate Cold Inland Sea Small planet with Thin Atmosphere
Yor love Cold Inland Sea Small planets with thin Atmosphere
Yor hate Warm, Archipelago Big Planets with thick Atmosphere
They both discover the planet Tau Ceti D with base planet class of 10. This planet is Warm Archipelago Big and has a moderate Atmosphere
For the Torians is the planet class: 10 +0(warm) +1(archipelago) +1(Big) + 1(moderate Atmosphere) = 13!
For the Yor is the planet class: 10 -1(warm) -1(archipelago) -1(Big) +0(moderate Atmosphere)= 7!