What is better shearing equipment to get? Lister or Heiniger?

We use Lister,an ancient one that we can still get parts for! And the shearer we use also uses a Lister. We are mainly Mules,with a few Texels. The shearer does about 120000 sheep a season (savage amusement!) of all breeds-there are a lot of Swaledales around us. A lot will depend on personal preference and what you can afford I guess. Not had anything to do with Heiniger,but you need to think about availablity of parts whatever you get. Happy clipping!