I went on a tip comparison adventure:
For the most detail-oriented and brightest sound, the included double-flange tips (I use the smaller set, can't get a proper seal with the larger ones) with a deep insertion fit are best. You can clearly hear the transition from the warmer low driver to the brighter high driver. I actually quite like the sound presentation of these tips, as the soundstage isn't lacking despite the deeper fit, and has the more analytical sound that I'm used to. Cymbal crashes will sound correct and not be attenuated, as they can get with the Comply tips. Bass response is also the strongest and most well-textured. Sibilants are a little more pronounced with these tips, but the BA200 is tuned to be non-sibilant anyway, so it's not really a real issue. However, the flange edges are hard, and will cut into the skin of your ear canal after a while. They're also difficult to remove because of that, as those flanges act like barbs that dig into the ear canal and refuse to come out.
For the best comfort and most pleasant, laid back sound presentation, the Comply Ts-100 are the best. However, everything is smoothed over and the highs are a bit knocked down and the far tuning of the highs is accentuated. Sibilance is non-existent with these tips, and the low/high transition is just about unnoticeable. Thus, everything has a slightly warm tonality to it. Shure Olive tips behave similarly, but overall the Ts-100 is better with respect to sound, presentation, comfort, and even ease of use, since the Ts-100 are designed not to need squishing every single time you put them in.
Sony hybrid tips, which normally work well for many applications, are terrible with the BA200. I tried the medium size (green) with both Monster red expanders and the cores of an old set of Shure Olives, and both times, the hybrid tips made the sound muddy. I had some similar hybrid core tips that came with my DBA-02, but they didn't seem to seal in my ears correctly, and wasn't able to test their performance.
With those Shure Olive cores, I began testing out my huge set of random, generic silicone tips. They seemed to all produce a similar sound, whether it was a triple flange, double flange, or single flange. They all warmed up the upper mids, making the low/high transition less apparent (but still there, if you listen carefully). Bass response varied with each type of tip and the softness of silicone used. Flimsier silicone seemed to elicit less of a bass response and warble the details. It seems like harder silicone is more suitable for the BA200. Some of the bi-flange tips seemed to push the highs forward a little, but none were as impressive as the included bi-flange tips with regard to clarity and detail. Anyway, none of the tips particularly impressed me.
Klipsch tips were very comfortable, but they seemed to respond the same way as all the soft silicone tips I described above. I quickly stopped listening to music with them on.
So, it looks like TDK did a very good job in selecting the right type of tips to bundle with the BA200. The bi-flange tips are clearly the most detailed and neutral-sounding tips, while the Complys are the most relaxed and smoothed, making the selection that TDK gives us almost diametrically opposed to each other. The bi-flanges optimizes the BA200's technical performance, while the Complys optimize their presentation and comfort. It's too bad the bi-flange tips can get so uncomfortable over time; otherwise, they really make the BA200 sound very impressive.
