Double wall bmx rims ?

im looking at a bike and it has alloy double wall rims is alloy good i thought alloy was another name for aluminum ? what are the different types of metals do most bmx bikes have on their rims alloy, chromoly ,aluminum,steel? which is better also i am looking at some double wall rims and there are alienation... show more im looking at a bike and it has alloy double wall rims is alloy good i thought alloy was another name for aluminum ? what are the different types of metals do most bmx bikes have on their rims alloy, chromoly ,aluminum,steel? which is better

also i am looking at some double wall rims and there are alienation and odysee and stuff but theres a nice pair of wienman rims that fit my budget and they are all double wall rims and they are all made out of alloy so my question is if these three different brand name rims are all double wall and made from alloy arent they all the same like strenght wise and lightness wise ? what makes one brand better then the other ?
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