When in doubt, take the underdog or under logic?

[dynamite140]

I heard this a few times from people but not sure if anyone have heard of this. But if there is a game and its a tough decision for you on the side or total, would you agree taking the underdog or under is a good idea?

[jeffksu]

Both the underdog and under in this situation will give you a better chance of winning both or at least a split...

[brxbmbers42]

definitely when unsure i take the points. not so sure about taking the under

[str]

Absolutely.

[Michaelmakesit]

How about when in doubt dont bet !