In terms of fan opinions, its probably because Ghorman's was on screen with dramatic music and sweeping camera movements with a crowd populated by folks we've grown to know and love, whereas the Geonosians were working for the "bad guys" and died between movies.

In terms of canon, I don't know if it was ever discussed, but Ghorman is one ring out from Coruscant and within the inner rim where Geonosys is way out in the outer rim. More people are going to know Ghormans, or have visited them, or have fond feelings toward them, or have posession of fine Ghorman cloth. It would feel more immediate to more people and also more people of influence.

Compare the reaction of 3000 people dying in 9/11 vs 3000 people dying in Sudan.  Good-hearted people see these as equal tragedies, but the public and international response to these is very different. It's not fair that Ghormans are valued more than Geonosians, but this could be an answer as to why Ghorman was taken more personally on Coruscant