In preparation for making my Leviathan game engine, i realized I have only researched 2D graphics up to level 3. Are 2D graphics ever better than 3D graphics of the same level, for particular genres perhaps, or is it strictly a cost thing?
Yes they are equal at some levels.
Graphics are calculated as tech level during the review phase. 3D graphics only overtake 2D graphics at V4, and every version after that. 3D V2 and 2D V2/3 are all equal, as well as 3D V3 and 2D V4/5.