I haven't auditioned the Westone 1 or the SE215. However, it is important to note that the SE215 is a dynamic driver, whereas the Westone 1 is a Balanced Armature. Those different designs create drastically different sound signatures, and it really comes down to user preference on which one is "better".
If you like details and clarity, the 1 might be a better choice. (You could also check out the UM1 if you prefer a flatter, more accurate sound)
If you prefer a "fun, enjoyable" sound, and don't plan on using them for stage monitoring or anything, they you might be more inclined to check out the 215.
The turbine has a bassy sound, and is a dynamic as well. You can find them refurbished for $50 from the Monster Turbine Store.