which one do you think is better and why..
I think initially your perception of the 535's if you buy them first will be that they lack any definitive bass, since the Shure house sound is more mid-centric than most other companies. Now, with my own, I feel as though the bass definitely has some quality to it. It's not overbearing so I can't really say much other than that
As for the IE80's, I don't really have a comment on, since I've never heard them.
That's my 2c.
the se535 bass is natural, its more of a ''how its meant to be heard bass'' for instance, some songs when i listen to my se535-ltd-j it seems like the bass is lacking, then i turn on another track and the bass is more defined, heavy and deeper extension.
this is becuase the iem's are replicating how the bass was meant to be heard in the track, imo with the se535 you hear mid bass if your supposed to, you hear low low bass if your supposed to.
the bass is tight very controlled and is more quality than quantity, the bass isnt over emphasized, or synthetic sounding. some people mistake the se535 for not having bass, it imo wasnt meant to have saturated overemphasized bass.
i listen to ALOT of house,dance,trance,dubstep andthe like, and find the bass to be more than suited for those genre's now its not head shaking bass, its not supposed to be.
the se535 have lush mids, forward mids,sparkle highs,slighlty forward vocals,amazing instrument separations,detailed sound, great clarity.
There's a lot of questions you can ask yourself when choosing between these two.
1. Do you like bass? IE80
2. Do you like a very wide soundstage? IE80
3. Do you prefer clarity? SE535
4. Do you like mids? SE535
Both are rather fun and musical, and plays music rather emotional like you're in a concert, but I would pick the SE535 since I'm kinda sensitive to bass, not saying that the IE80 has boated bass however, just deep quality bass, but not my type.
IE80 will perform fairly well with metal, SE535 will lack that oomph is the bass for that. Soundstage of the IE80 will make you feel like you're in a concert, sitting at the back of the row.