LAME is great, and in fact it's better than e.g. the ffmpeg AAC encoder at equal bitrates, which is telling. But the MP3 format has fundamental limitations that no encoder can fix, and Opus is unquestionably better in every way. What I'm saying is I'm pretty sure you can find killer samples for 320k LAME (under very good listening conditions), while that's a lot less likely for something like Opus.