If I could only have one, I would wait until the was a better reason to have the best one indicated by that reason. It does not sound like you have a need to have either at this time.

Getting testing done without a specific symptom to understand lead to a negative result. Negative meaning, there was no indication of a problem.

It is unlikely that either would find a problem. Save your money and the insurance companies money until there is a better reason for more testing.

The last thing you want is a bunch of tests with negative results but you continue to complain about symptoms. This can lead some doctors to label you as having a somatoform disorder. This label can be the kiss of death to further worthwhile care.