Default What is best setting for "Preferred Network type"

Under mobile networks.

I have ATT in New York area so I get a good bit of LTE.

I never once had looked at this before, but since i was having some signal drop i just checked on it and noticed that my preferred selection would change without me doing anything. I flashed a new radio and seem to have resolved the drop issue, but now I don't know which setting I should be using.

Right now I have it set to GSM/WCDMA AUTO, but I am only showing an H for signal so I am not sure if this setting restricts LTE

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