It's neither safer or necessary. If your income will continue from the same source once in the USA, and it is enough to qualify, they won't accept a joint sponsor anyway. A joint sponsor will not take away the need to show clearly that you intend to re-establish domicile in the USA. Many discussions about the domicile issue here, but it is fairly simple to deal with.
Lots of false information out there and sometimes here too. The difference is that here, somebody will come along and correct the false information or faulty advice.