I haven'd heard either of the two headphones you have posted but I have heard 3 out of the 4 IEMs you are looking for and can provide some quick ideas of what they sound like
B2: Bright sound signature with very detailed treble and slightly analytical midrange. Bass is flat and has decent body without a whole lot of impact or sub-bass rumble. Mid sized soundstage width/depth
TF10: V-Shaped/Fun sounding signature with enchanced treble and bass. Best bass texture/detail/impact I have heard from a universal IEM. Perfect quantity IMO. Midrange is slightly recessed but still excellent in its own right. Sound stage is about as large width speaking lacks depth/height in comparison. Top tier sounding IEM and you will most likely be looking at side grade than upgrades from TF10s.
RE262s: these NEED an amp. Sweet/warm sound signature. Rich mids, inoffensive treble, and pretty good bass with sub-bass rumble.. Mid sized soundstage but has exceptional depth/layering of music.
