Make sure to get the upgraded drivers on the Thiel. (Can't comment on the Alon).
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The Thiel is a bit more refined sounding speaker than the Alon.
I have the Alon II mk2's and they are a well rounded speaker. They can play all sorts of music well, but their strengths lie in reproducing Jazz and Rock. When I think of the Thiel sound, I think of more classical and acoustic music. Alon speakers are also killer for Home Theater. I use Alon speakers for my sides and rear channels.
Soundstage is great on the Alon II mk2's. These speakers are a great value on the used market.