Just my opinion from my experience.
I mow roughly 4ish acres.
I first used a
B2920 with a MMM and although the cut was fine the tractor was heavy. It got close to where I needed to be but still left a good amount of string trimming.
I then purchased a
L3540 cab as I have allergies and being climate controlled is nice. I pulled a 7' rear discharge deck from bush hog. Did a great job in the fields. It was simply to difficult to get close with turns and left a lot of string trimming. Also with weighted tires and on clay, the tractor was just heavy and would cause "ruts" (over exaggeration) but cause waves or slight bumps. When the clay dried out the was actually a rougher ride.
So I then decided to use a 50" walk behind close to the house and the 7' everywhere else.
Being I like my grass manicured the tractor is the wrong choice (At least for my situation) (weight 5000 lbs vs 1500 lbs , speed, overall finish and cost ratio). I also aerate my lawn (huge improvement with the soil compaction from the tractor). So I picked up a scag cheetah 60". This ztr cuts excellent and leaves my grass in much better shape. I can also cut my property in less time the if I used the tractor with 7' deck. Being I can get super close, it leaves very little string trimming. I'm not promoting scag, (although I like it) but as mentioned above, a high end ZTR would probably be best.
I sharpen blades often on all equipment and like to try things for myself. I'm not trying to push you anyway, just saying I've kind of been there.
Also, your 6060 I think is 9" longer than my 3540.
I'm also in the market for a flail but definitely not for my lawn. ( the manicured areas). I've read a lot about them and look forward to using them to keep fields looking good monthly. (I also do a lot of cutting / brush work ) for others. Right tool for the job. So I am acquiring all the tools.