Owning an L5740HSTC and an M8540HDC, I can certainly understand both sides of the coin. I often run both in a single day and bought the
L5740 after the M8540 for the tight, close in work that will wear you out on an M or the M simply won't fit. I love the M Series Kubota and really like the equivalent in JD, Massey etc., but there are times a CUT like the
L5740/6060 is just the right tool.
I wouldn't/don't worry about burning out the hydraulic clutch on our M Series and we use it for a lot of back and forth loader work and box scraper in addition to running a 10' pull type rotary cutter, they are very good systems; same goes for the other makes.
I am slower than my sons doing loader work with the M8540, but they will usually grab the
L5740. They can operate both about as quickly, but are much more tired at the end of the day on the M.
Yes, the M is a stronger, more robust machine, will lift and pull more, but for our uses, there will always be a need for the 5740. Cost is high, but the HST+ is worth it for us at least and I noticed the new John Deere CUTs have an eHydro with some of the same features.
I am adding a grapple right now along with 400 pound wheel weights to go with the filled tires as we work on a lot of hills, my counter ballast is a Land Pride HR3584 at a bit over 1100 pounds.
I didn't get draft control, but at times kind of wish I had.
I can't honestly say which is best for the OP, only relay our experience.