Hi! I thought I will ask advice from you, guys, as experienced with butchering. I need to sharpen my knives for butchering my next batch of cocklrels. I was told the combo stone I need to buy for that. I got a Smith;s stone for 30 $ with 3 functions - fine middle and coarse . Then I went to Asian Market and saw one for 6 $. with 2 sides - coarse and fine. The more expensive one is ceramic, the cheap one is aluminum. Is there a big difference? Any advice would be appreciated. I would hate to spend 30 bucks in vain Should I keep the expensive one , or cheap one will do the job? Thanks in advance.