With something like this you only get what you pay for. If you are experienced in machine polishing then a rotary type (the one highlited)of polisher would suffice. The Porter Cable (PC) type of polisher is a different type of machine to the rotary. The PC is a dual action machine in that it mimics tha action of the hand and doesnt just rotate. Both types of machine require a degree of skill however the PC is easy to use by a novice and there is less chance of damaging your vehicles paint.

When using a Rotary machine there is a great deal of skill involved to make sure you leave a defect free finish and do not cause any furhter damage.

If this is your first go at compounding and defect removal and you go with the rotary i would recommend practicing on a scrap panel prior to having a go on your own car.

If you ask on here you may find someone who is local to yourself who would be willing to assisst with a practicle demo of the machines in action, this could help you decide what to go for.

HTH

Billy