Seriously...
Get whatever you feel comfortable with. Like many said the difference from one to another at the levels they're loaded to will be slight. Somebody is gonna have to show me the math for me to believe that the round are stronger, but that's my problem (to paraphrase Buscemi in Fargo "I didn't come all the way down here to f###ing debate you". The best I have ever seen in action is 2x3 tube welded frame section to frame section through the floor. this will even stiffen a convertable.
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