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With the exception of GameCredits, al the coins I deal with outside of BTC are POS coins. Tek is BY FAR the easisest to stake. I have more than once even in times of high difficulty staked 1 coin. From watching it, and my own lacksadaisacal approach, I would guess that a great many people do NOT pay close attention to the diff. Those that do, get the greatest rewards. The rest of us are probably averaging 23 to 30 percent per month.
Of all the coins I play with, TEK still tops my list for POS coins, followed very closely by HyperStake. Hyp is a very different beast, and very HARD to stake. I shan't discuss that here, as it's out of place. I also like TRK and Version 2, but it's mainly because of their Dev, noise23. At this moment, they don't have great markets. TRK is rising pretty well, though, and might be that latecomer that surprises everyone. Vegas really likes Orbit, I have no experience with it. NXT scares me, but it has done well.
All in all, when I have spare BTC, I buy TEK ahead of all others.