Old Km Or New Km

[ukhookah]

ive had my km for a long time now. may be got it in 2005. i have the khalil mamoon kafae designed. i had a debate with my friend. He thinks a new km would smoke much better compared to the one i have. i was against this thought of thinking. may be if he was right?

My khalil mamoon kafae design does produce some green residue which i wash out after each smoke. so i guess my inner steam may be made of copper? instead of being brass?

Has anyone else owned this type of km that i have and also owned another more upto date km?

are there any difference in the quality of the smoke?

Finally i am considering now to get a km trimetal

Thanks in advance for any input!