I own a Grumman AA1B and have flown and instructed in the AA5 series. I think they are very under rated aircraft with great visibility, delightfully light controls and they are significantly faster then the equivalent Piper or Cessna. They are not great short field aircraft but do OK if the weight is kept down. The choice of Cheetah or Tiger will be driven by how big a load you want to carry. IMO the sweet spot is a Cheetah with the 160 hp engine mod and the optional 50 US gallon long range tanks.