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As a 520 owner, I'd have to suggest the 510.
The Sandforce SF-2281 controller is notorious for the dreaded "F4 BSOD" while entering or waking from sleep/suspend modes, and although Intel have improved the issue with their firmware, it's far from perfect. There are also some compatability issues with laptops and Macs.
I doubt the 510 series is without its own issues, but generally the Marvell 9174 is a super-reliable controller. It does not have the benchmark speeds of the Sandforce (which beats it hands down with compressible data) but in normal use this would be barely noticeable, particularly if you're coming from a HDD.
If you're after pure reliability/stability, IMHO it's a no-brainer : 510 every time.
This is irrespective of any particular technology, but reliable drives are those that have been in the marketplace for the longest and with the fewest issues. Since manufacturers do not release detailed return or reliability results, (only estimations) you don't know for absolute sure, but the 510 series has a fairly good record.
Having said that Intel also has a pretty good record reliability-wise, and I would go with a 520 series personally all things considered.
Using a 520 here, absolutely no problems. I'm in and out of sleep mode all the time and never seen a blue screen issue.
Also have 520 for three months - no signs of sleep bug, and any other troubles. But must say truth - no seen real performance improvements over any SDD of its price.
Thank you for all replies. I bought the 510 series and works very well, I am very happy.
THank you for all suggestions and tips.