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Go with the incase snap smoke if you want something thin & clean. The matte finish also feels great. Hands down my favorite case thus far.
 
I have both too and they are very similar. Both very thin cases.

Snap: Love the translucent back and it shows the apple logo. The cutout around the vibrate/volume is kinda small so make it hard to increase and decrease volume. Dust gets around that cutout easily too.

Feather: Love the matte back for the feel. Larger cutout for vibrate/volume. The matte back does get scratches easily.

I'm using the snap right now because of the translucent factor.
 
The Sonix Snap is too flimsy

I'd say feather. Main reason is the price. Incipio is $25 w/ 2 screen protectors and Incase is $35 w/ a little stand.
 
The Feather is a FAR better buy IMO.

1. You get two screen shields with it.
2. Costs only $19.99 (at Target if you have one) vs. $34.95.
3. Tons more colors.
4. The Feather fits better.

My only complaint about the Feather is the small strip of the antenna left exposed along the volume buttons and vibrate switch. On the Incase this is covered.
 
I have both and I chose to stay with the Snap, because it extends past the face of the phone just a little, so it does protect the phone a little more than the feather.

Both are great cases though if you want minimal protection.

I'm actually selling my Black Feather with the new larger oval cut out if you're interested.
 
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