Which better internal compass or external compass?

hi guys im building a fixed wing. i want to ask a newbie question becaues im still noob. i have a cube orange pixhawk and a m9n holybro gps. which gps better? the external or the internal. help me please

the best one is the one getting the less interferences. That is generally the external one’s but it depends on your build so you need to look at your data to get the best one.

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thank you for your information sir. can i know what data or parameter we have to see in the log?