Hello and welcome first off to AquariumAdvice.com
When you say ' test kit ' I presume you mean a test kit in the manner of water testing ; IE Ammonia / Nitrate / Nitrite / pH levels etc ?
If so, you have a huge variety to choose from, from many different manufacturers. Because of this, it is ultimately down to personal favour.
First off, use the test kit you got with your tank, if you got one included ? If you decide it's not for you, there are plenty more as I say. Perhaps ask your local aquarium place of their personal choice.
Grant