similar topics, at similar settings, in similar order. especially if you remember that speaker for the dead was written first; OSC created EG as a prequel, liked it better, and published first. Speaker for the dead probably comes from card's life experience being a mormon missionary (hint: the piggies are the brown people he went to convert). Ender's Game comes from his life experience reading haldemann.

(OSC is also a weird and outspoken homophobe; easy to see him (a) misunderstanding forever war and (b) liking it for the wrong reasons).

Look, card is clearly the better writer between the two of them. He added a lot. But if you want to put forward war fiction as a case for empathy, it's irresponsible to look at EG before FW.