I ended it up getting the Tech21 Evo Clear with MagSafe. I took about 30 min comparing Speck to Tech21.
Speck Perfect Clear:
Pro: very protective, tight fit, lips are good all around, anti-bacterial coating, camera lip is more attractive (simple) vs. Tech21, very strong MagSafe magnets.
Cons: very very slippery (almost to same level as Apple Clear case), slightly thicker and wider (in all dimensions) than Tech21 (and of course Apple Clear case), the sides are not clear (cloudy due to shock absorbing rubber they use) and the finish of the cloudy finish is not uniform (some areas had clear defect in the rubber coating on side of case), the back polycarbonate has some sort of coating (clear) that seems to attract dust and hard get rid of dust once on it.
Tech21 EvoClear:
pro: very protective, tight fit (similar to speck), lips are good all around, anti-bacterial coating, just a shade slimmer in all dimensions than Speck (just ever so slightly wider than Apple Leather case; same thickness as Apple’s), the sides are not crystal clear but clear enough and finish is impeccable, very strong MagSafe magnets.
Cons: slippery but better than Speck/Apple, the camera lip is kinda over-done (thick and weird finish), less drop protection than Speck by 1 foot.
BOTH cases have mild softness of rubber/lip around the buttons…maybe a tad softer than Apple Clear case but I doubt that there is a significance difference in terms of keeping dust out of the sides of the case.
BUT, both have a rubber (clear) lining around the edge of the back of the case. The Tech21 has a more defined rubber edge around back of case than the Speck. Why is this important? Because this hopefully prevents dust bunnies from invading the back of the case. This is one weakness of Apple Clear case (esp 2021)…dust bunnies invade the back fairly easily.