Essentially the same thing, since you are training on weights so
quality don't really matter.
But this is what i notice, you get cheap cheap weights and don't
maintain, the bar will rust quite easily.
Cast iron weights you cannot drop it or it will literally crack
into 2 or more pieces.
Vinyl encapsulated or plastic weights are almost the same thing,
vinyl ones are just a layer of vinyl covering a cast iron weight
underneath. Plastic weight usually contain concrete or
cement.
I suggest for $48, you get this Kettler set, you get 2 1.25kg and 2
2.25kg and the bar. Then from then you can get the extra weights
seperately.
it's vinyl one.