Halo Reach had much much much better vistas and skyboxes than Halo 4 had. Halo 4 tried to compensate their shitty distances with lens flare or other methods. Also Halo Reach had much better character models when it comes to armor.
Halo 4 obviously had better facial expressions and interiors, no question about it.
It's pretty hard to choose for me. Halo 4 interiors and Forerunner architecture were absolutely stunning, while Reach's skyboxes were the best I'd ever seen.
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Oh god. I love the design and concept of 4's skyboxes, but yeah, a lot of them were just like painted domes above the level. :/
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-blam!- yeah did it have better character models
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They both look great in different ways I understand 343s less detailed textures though considering we're at the end of a console lifecycle