Same thing, Ragnarok. If I say it should be played a certain way or it's supposed to be a certain way, that's just me saying I wish it would work like that.
Yes ... "should be" and "is supposed to be" are same thing ... im aware.
But again, the name of topic is "the way YOU wish" ...
Dont you see the difference?
Or english dont make difference in unexpressed subject? O_o
I mean, translated to Czech the difference between those sentences is that in first case, you have set of rules you are oblighted to follow ... in second case you dont and you create those rules youreself.
//Edit:
Basicaly as JandK say.
It's splitting hairs - like REALLY splitting hairs.
If my friend comes up to me and says, "Dude. You should not wear that shirt." That's his opinion. But he told me I should! Yeah. So. His opinion is that he thinks I shouldn't wear the shirt I'm wearing. Doesn't mean I actually shouldn't wear that shirt. That's just his opinion.
Same thing with "supposed to be." If my friend says, "Dude! That lady is wearing a very low cut shirt. That's not how women are supposed to be. They should dress more modest. That's supposed to be how a lady acts."
It's all the same thing. That's his opinion. That's how he believes women should be and are supposed to be.
So, yeah. It's probably all coming down to translation and the nuances of certain cultures. It is VERY common where I live that people use both "supposed to" and "should be" interchangeably with "this is my opinion".