Folks,ive narrowed down my search to get a Maruyama hedgetrimmer ,but cant decide between the 237 \238 and 239 models,not much info on the Manufacturers website or sellers regarding specs difference?. Im looking at possibly going with the middle model the 238 and in the longer length 30".Any ideas on technical differences between them ,also best seller.Thinking of going with Monaghan Hire as im based in Meath.