Pound for pound, dollar for dollar, the 135 Massey Ferguson just might have been the best utility tractor ever made. They are still a great seller. Well balanced, good power, VERY reliable, all the bells and whistles a tractor of it's day should have. They're comparable to a Ford 3000, only MUCH more desireable.
They have live power, about half have power steering, good hydraulics, easy starting, and VERY easy to get parts for. There were a few choices for engines over their production run. A 4 cyl. gas Continental, a 4 cyl. diesel/ 3cyl. diesel Perkins. Some had "Multi-Power" transmissions. That was a nice feature WHEN IT WORKS, but was about the only un-reliable option ever to grace the 135.
The only tractor (of this size and age) I like MORE than the 135 would be the 150 Massey Ferguson. It was almost the same tractor, with the exception of having a heavier front axle, better mounting points for a loader, and a bigger fuel tank.
I'm about as much of a die-hard John Deere fan as you will ever run up against, but credit where credit is due..... The 135 Massey was a tough act to beat. (still is in my humble opinion....)