Both of these games' reveal trailers were darker, moodier, more wistful and more melancholic than anything that'd come before breaking from the garish, whimsical shorts of the day that, for me, defined video game promotion at the time. In cinematic terms, however, they remain unsurpassed.
Visually, they may not look quite as pretty against today's cutting edge standards, but they do still hold their own – especially given they're (somehow) now a respective 17 and 12 years old. Both the GTA 4 and GTA 5 reveal trailers were groundbreaking in their own ways.