I am leaning towards the 855 based on appearance and some repairs listed. Has new frt tires, axle seals and a seat. At least someone spent a few dollars on it so hopefully it was maintained. Present owner hasn't had it long. Paint looks faded but all there. I'm guessing it hasn't sold due to the hours.
I just got some pics of the 955 and it looks like it was used hard to me and kinda rusty for something claimed to have been stored inside. It has R4s on it which I don't believe were standard back then and they are about worn out. I also found another 955, with 1300 hrs, that a dealer has but I don't like what I see with the frt bucket. They welded angle on top with hooks and there are some kind of heavy attachment tabs welded inside. Makes me wonder what they were lifting or draging with it. Also spotted a lot of spray bomb work, overspray on hoses ect.
I know this is a hard question but should I expect problems with the 855 having 2100 hrs? I'm 62 and will be mowing about 3 acres with a 6ft RM finish mower plus whatever chores I do with it. My thoughts are it may outlive me or at least my tractor time.