Inwards dont bend aha i have a pair in my house right now that a bent like crap want pics!?
And ive seen bent ones all the time at my park since i live near inward.
And if your not worried about weight hardlines are probably the strongest.
District Steel Bars, theyre strong because of the gussets and if you have anything over 14 wide you wont get your fingers stuck in the holes in the gussets