both of them mean "how"
如何is more formal than 怎么样,but the meanings are the same
这个看起来如何?=这个看起来怎么样?
people usually use 如何 in writing or formal situation
but there is an exception
you can say 你怎么样了(means how are you)?
you cant say你如何了?(this sounds a little odd)
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如何:it tends to be used in ancient chinese or in written chinese ,怎么样: it likes a oral one,you can hear 怎么样 in normal mandarin at street or 胡同,such as how are you.,what is up.
in brief,如何 is formal one,but 怎么样 is more oral or informal
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如何is often used in literal, but 怎么样 is focus on oral.