[General Accessories] Technosquid:
Samsung MB-MSBGA and Sandisk SDSDQUA-032G-A11A are both better, as well as any of the other model numbers of Sandisk Mobile Ultra Micro SDHC Class 10 UHS-1 cards, but all of these cards are significantly more expensive.

The Sandisk Mobile Ultra Class 6 cards (like SDSDQYA-032G-U46) may be better, too, but I don't have a proper benchmark at hand.

Sandisk SDSDQUA-032G-A11A

50MB test via USB 2.0 reader on a USB 3.0 port:

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

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Sequential Read : 18.372 MB/s

Sequential Write : 13.057 MB/s

Random Read 512KB : 18.703 MB/s

Random Write 512KB : 8.554 MB/s

Random Read 4KB (QD=1) : 3.150 MB/s [ 769.0 IOPS]

Random Write 4KB (QD=1) : 1.957 MB/s [ 477.8 IOPS]

Random Read 4KB (QD=32) : 3.590 MB/s [ 876.4 IOPS]

Random Write 4KB (QD=32) : 1.960 MB/s [ 478.5 IOPS]

Test : 50 MB [D: 0.0% (0.0/29.7 GB)] (x5)

Date : 2012/05/25 14:17:56

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

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Sandisk SDSDQUA-032G-A11A

100MB test via card reader on USB-3.0-bus-enabled laptop:

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

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Sequential Read : 44.269 MB/s

Sequential Write : 13.646 MB/s

Random Read 512KB : 42.179 MB/s

Random Write 512KB : 2.709 MB/s

Random Read 4KB (QD=1) : 5.341 MB/s [ 1304.1 IOPS]

Random Write 4KB (QD=1) : 1.843 MB/s [ 450.0 IOPS]

Random Read 4KB (QD=32) : 5.716 MB/s [ 1395.6 IOPS]

Random Write 4KB (QD=32) : 1.235 MB/s [ 301.5 IOPS]

Test : 100 MB [H: 0.0% (0.0/29.7 GB)] (x5)

Date : 2012/05/23 12:58:25

OS : Windows 7 Enterprise Edition SP1 [6.1 Build 7601] (x64)

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Samsung MB-MSBGA 5 x 100MB test via USB 3.0 reader in USB 3.0 port.

Sequential Read : 23.33 MB/s

Sequential Write : 12.57 MB/s

Random Read 512KB : 22.99 MB/s

Random Write 512KB : 12.27 MB/s

Random Read 4KB (QD=1) : 8.128 MB/s

Random Write 4KB (QD=1) : 1.361 MB/s

Random Read 4KB (QD=32) : 8.260 MB/s

Random Write 4KB (QD=32) : 1.361 MB/s

Sorry about the inconsistency in the testing methods, but these values have just been cobbled together through forum postings. The only one of the three I have personally tested was the SDSDQUA-032G-A11A, and many of the values were much lower since I was on USB 2.0 adapter and port.

I also tested a SDSDQUA-032G-A11A (Class 10) and a SDSDQM-032G-B35N (Class 4) side by side installed in two Dell Venue Pro Windows phones, but I didn't see much difference in performance. The biggest difference I saw was about a 30% reduction in the time it took to install a 100MB game app. Some newer phones might have UHS-1 enabled readers which may show a larger performance difference.

If you're looking to spend extra, my best recommendation is the Samsung MB-MSBGA for the consistent speed throughout all of the benchmarks. Otherwise, just go for the Sandisk SDSDQM-032G-B35N Class 4.