Norton did an auto scan and said I had 3 threats from TB but then I scanned the folder with Malware bytes ans Avast and it said I was safe should I believe Norton or what

What kind of threats? And also, did Norton already fix that? That would explain why Avast and Malvare bytes didn't find anything.
But on the question. I've had some not too good experiences with Avast and don't know much about Malware bytes, but it's still 2 against one so I'd go with Avast and Malware bytes.

I do not have full norton it just scans my pc it said trust level was poor

Norton SUCKS.

Stay with Avast! and Malwarebytes

Norton actually fucked up my computer at a point, i'm not sure how.

if you get norton to scan anything it`ll find a problem mlawarebytes doesn`t lie and tb doesn`t have any viruses i scanned it 7 times no threats

Norton can appear to be a buisness trick.

Norton is bulls***. You cant trust it.
Get another one, NOW! I dont recommend it.

I suggest getting rid of norton. It is almost as bad as a virus. it made it so i couldnt go online unless i resubscribed!!! by the way TB has no viruses unless u downloaded a script into it that was a virus.

get rid of norton,it sucks.get AVG, it kick's norton's ass.