I have AP and personally they aren't so good., IMHO. Hard to get consistant results and hard to read the colors.
I think for GH, KH and pH they should work fine but for NO3 and PO4, there is a better kit out there, I think Red Sea for one and Hagens for another but I don't remember.
Either kit will work but make sure you callibrate them with a known solution so you know what your results are for sure and not guessing. I recommend that for any and all kits. If you need to get a less expensive one, the AP should work fine. I may not like it but it does work well enough to give me the results I need to see.
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