HEVC and AV1 can be compared, and AV1 can even make smaller size files, problem is encoding time and decoding hardware. AV1 is considerably more CPU intensive than HEVC, unless you have RTX 3000 or RX 6000 which have AV1 decoding imbued, which will help
AV1 is more efficient than HEVC, which makes it have a smaller size than HEVC at the same quality.
As SoZluKa pointed out, as of right now very few devices have AV1 hardware decoding support. On top of what he said, the new intel GPUs, both integrated and dedicated, support AV1 decoding and the dedicated GPUs also support encoding. Almost every Smart TV from the past year has hardware accelerated AV1 decoding. And smartphone SoCs are starting to support it as well. Seeing how it's advancing I would assume that in the next year the support will grow a lot more.
The encoders are still in development and they haven't reached their maximum potential, but if you use software like Av1an you can encode at very good speeds.
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Cclrx
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