I have heard bad things about the little strips. I would go with the digital tester. Much more accurate results.
I would suggest a digital tester too. You can find them for pretty cheap on eBay. Make sure you pick up some calibration solution too.
I have them all. The Hannah PH meter is GREAT but you have to pay attention to the calibration or your results will be off and disaster pre-programmed. On Edit: Do NOT buy "El-Cheapo" or you're gonna get results accordingly. Or get a MUCH CHEAPER liquid test from Walmart (Aquarium section) or Pet store. Costs only a few bucks and works just as well.