For bodybuilding, a good machine would be one which targets your intended muscle/s, through a full range of motion preferably, which feels comfortable with your body proportions, which can have increased resistance easily as you progress.
There are alot of good plate loaded leverage machines for all different exercises, like Hammer Strength, if they are isolateral, it's even better.
Some cable machines can be good too, for certain exercises, you can do so much with just a lat pulldown machine which also has a low pulley.