If you only have bettas and you dont have a saltwater tank, Then the the test strips, There easy, fast and clean. The API is nice dont get me wrong but if your only keeping fresh water fish or betts then you dont need all that crap diping water out driping this into it shake it, okay that is reading okay now get some more water test for the next thing.. Its like a full time job between cleaning tank doing water changes checking water levels. I just want to keep fish not a full time job. Like I said in another post everyone I no that has bought that API kit only used it threw the cycle then went and bought the strips, and don't follow me but I have went a month's without doing a water change, and tested the water, couldn't believe it was perfect, had a little smell to it but everything was fine.
Anyway if you want something easy and just to give you that peace of mind that you no what you water level's are then get the strip's even petsmart uses them at least the one buy me. But it's up to you at the end of the day..