Reply to native instruments maschine mk1 ot mikro mk2

Hi all soon I will buy native instruments maschine.My budget is limited so I need to buy on ebay or or to look on other on other pages used goods.So the big problem is that I need to decide wich maschine will buy.Could you help me and tell wich is better to buy maschine (mk1) or mikro maschine (mk2) and why.